Targeted literature searches are a fundamental part of writing clinical manuscripts that will meet the standards of high-quality journals and contribute meaningfully to evidence-based practice. When physicians write clinical manuscripts, utilizing a targeted literature search can identify high-quality, relevant, and current evidence. While a general literature review is useful, a targeted literature search is specific to the clinical question and should be completed through frameworks established, such as PICO (Population, Intervention, Comparator, Outcome) and PRISMA [1].

How to Format References and Citations in an Original Research Article

Original Research Article

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How to Format References and Citations in an Original Research Article

Table of Content
1. Why Proper Citation Formatting Matters
2. Citation vs. Reference: Know the Difference
3. Common Referencing Styles
4. In-Text Citations: Structure and Placement
4.1. APA Style Example
4.2. Vancouver Style Example
5. Formatting the Reference List
6. Examples of Different Source Types
7. Reference Management Tools
8. Common Errors to Avoid
9. Conclusion
10. References

Proper referencing is a cornerstone of academic integrity in original research articles. It ensures that prior work is acknowledged, supports claims with verifiable sources, and allows readers to trace the development of scientific knowledge. Incorrect formatting or inconsistent citations can lead to rejection, plagiarism accusations, or loss of credibility. This article provides a detailed, structured guide on how to format references and citations in a research manuscript.

1. Why Proper Citation Formatting Matters

Avoids Plagiarism: Proper citation is a legal and ethical requirement to prevent plagiarism.
Maintains Consistency: Standardized formats provide uniformity and readability.
Facilitates Peer Review: Reviewers can verify cited claims quickly.
Supports Reproducibility: Researchers can follow up on referenced studies for validation or replication.

2. Citation vs. Reference: Know the Difference

Term	Definition	Example
Citation	A brief mention of a source within the text.	(Smith et al., 2020) or [1]
Reference	A detailed bibliographic entry at the end of the article.	Smith J, Brown R. Title. Journal Name. 2020.

3. Common Referencing Styles

Style	Used In	In-text Citation	Reference Format
APA (7th ed.)	Social sciences, psychology	(Smith, 2020)	Author. (Year). Title. Journal, vol(issue).
MLA (9th ed.)	Humanities	(Smith 2020)	Author. Title. Journal, Year.
Chicago	History, arts	(Smith 2020) or superscripts	Author. Title. Journal, Year.
Vancouver	Medicine, health sciences	[1], [2]	Author. Title. Journal Year;Volume(Issue): Page.
IEEE	Engineering, computer science	[1]	Author. “Title,” Journal, vol., no., year.

4. In-Text Citations: Structure and Placement

In-text citations should match the reference list and must be inserted at points where external data, findings, or statements are referenced.

4.1. APA Style Example

Single Author: (Smith, 2020)
Two Authors: (Smith & Jones, 2021)
Multiple Authors: (Smith et al., 2022)

Example:

Cognitive deficits are increasingly recognized as a core feature of psychosis, with approximately 80% of affected individuals exhibiting clinically relevant impairment (Reichenberg A, 2009).

4.2. Vancouver Style Example

In-text citation: Superscript numbers are used.

Example:

High-fat diets are associated with insulin resistance.¹

5. Formatting the Reference List

Each reference style follows specific rules for author order, capitalization, italics, punctuation, and DOI usage.

	APA Style (7th Edition)	Vancouver Style
Journal Article	VanderKruik, R., Barreix, M., Chou, D., Allen, T., Say, L., Cohen, L. S., & Maternal Morbidity Working Group. (2017). The global prevalence of postpartum psychosis: a systematic review. BMC Psychiatry, 17(1), 272. https://doi.org/10.1186/s12888-017-1427-7	VanderKruik R, Barreix M, Chou D, Allen T, Say L, Cohen LS, et al. The global prevalence of postpartum psychosis: a systematic review. BMC Psychiatry. 2017;17(1):272. http://dx.doi.org/10.1186/s12888-017-1427-7
Book	Kothari, C. R. (2013). Research methodology: Methods and techniques (2nd ed.). New Age International.	Kothari CR. Research methodology: Methods and techniques. 2nd ed. New Delhi: New Age International; 2013.

6. Examples of Different Source Types

Journal Article with DOI (APA Style): Cnattingius S, Källén K, Sandström A, Rydberg H, Månsson H, Stephansson O, et al. The Swedish medical birth register during five decades: documentation of the content and quality of the register. Eur J Epidemiol [Internet]. 2023;38(1):109–20. http://dx.doi.org/10.1007/s10654-022-00947-5

Book (Vancouver Style): Kumar A. Molecular Biology: Concepts and Experiments. 2nd ed. Oxford: Oxford University Press; 2019.

Chapter in Edited Book (APA Style): Sharma, R. (2018). Food security in India. In A. Mehta (Ed.), Global Agriculture Policies (pp. 75–94). Springer.

Conference Proceedings (Harvard Style): Gupta, A. (2020). Machine learning in bioinformatics. In: Proceedings of the International Conference on Computational Biology. Hyderabad, India, Jan 10–12, pp. 88–93.

Government Reports (Vancouver Style): Ministry of Health and Family Welfare. National Health Profile 2022. New Delhi: Government of India; 2023.

7. Reference Management Tools

To maintain consistency and automate citation formatting, researchers are advised to use reference management software:

Tool	Key Features
Zotero	Open-source, browser integration, cloud sync
EndNote	Comprehensive style library, citation generation
Mendeley	PDF annotation, citation plugin for MS Word
RefWorks	Cloud-based, institutional access

8. Common Errors to Avoid

Inconsistent Style: Mixing APA and Vancouver formats in a single paper.
Missing References: Citing sources in-text but not listing them in the references.
Incorrect Author Order: Especially critical in biomedical sciences.
Improper Use of et al.: Follow the specific rule (e.g., APA allows it after 3 authors).
Broken Links or Invalid DOIs: Always test URLs and check DOIs before submission.

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Conclusion

Correct reference and citation format is more than a technical requirement; it reflects a commitment to the scholarship of the author. Whether APA for social sciences or Vancouver style for medical journals, accuracy and consistency are boilerplate requirements. Utilize digital systems and journal-specific directives to enable you to complete this process with ease. Always check that the final manuscript fits the publication requirements before submission.

Need expert support in formatting your references and citations? Connect with Pubrica’s academic writing specialists to ensure journal-ready submissions.

References

Kępińska, A. P., Robakis, T. K., Humphreys, K., Liu, X., Kahn, R. S., Munk-Olsen, T., Bergink, V., & Mahjani, B. (2025). Familial risk of postpartum psychosis. The American Journal of Psychiatry, 182(6), 542–550. https://doi.org/10.1176/appi.ajp.20230576
Mancini, V., Latreche, C., Fanshawe, J. B., Varvari, I., Zauchenberger, C.-Z., McGinn, N., Catalan, A., Pillinger, T., McGuire, P. K., & McCutcheon, R. A. (2025). Anticholinergic burden and cognitive function in psychosis: A systematic review and meta-analysis. The American Journal of Psychiatry, 182(4), 349–359. https://doi.org/10.1176/appi.ajp.20240260