A diploma is one of the most important works at the beginning of a young scientist's career. Incorrect formatting can negatively affect its uniqueness and the defence procedure. What mistakes should be avoided when formatting citations? How to correctly format references to sources? Let's have a look in today's article.
What is citation?
Citation is the process of reproducing information from another study in one's own work. This can take the form of a direct quotation, graphic materials from another study, etc.
Why is citation necessary?
- to reduce plagiarism
- to confirm the reliability of information
- to supplement the content of the study
Styles of citing literature
In the scientific community, there are sometimes disputes about cases of plagiarism, which leads to increased requirements for the formatting of citations. A common way to format citations is to use appropriate styles, such as APA, Vancouver, Chicago, etc.
APA citation style
The APA style is one of the most common formats for citing literature, developed by the American Psychological Association. This style was originally developed for use in psychology, but was later adopted in other disciplines.
An APA citation can be formatted in two ways: as an in-text reference in the relevant part of the work or as an out-of-text reference in the form of a bibliography. Its distinctive feature is the use of the author-date format, which allows the source to be quickly identified.
Citing in the text of the work
Only the author and year of publication are indicated in the text of the work, for example:
- (Kovalenko, 2025)
- “The author A. Kovalenko (2025) researched that...”
If it is a direct quotation, the page number must be added:
- (Kovalenko, 2025, p. 35)
If there are several authors in the cited work:
- 2 authors – (Kovalenko & Sidorenko, 2025)
- 3 or more authors – (Kovalenko et al., 2025)
Formatting the reference list
The reference list in APA style must be presented in accordance with the following criteria:
- Sources should be listed in alphabetical order according to the authors' surnames.
- All sources listed in the bibliography must be cited in the text of the work and vice versa – all references in the text of the work must be listed in the bibliography.
- Each source must be accompanied by a DOI. If this is not available, provide a link to the active web page.
Sources in the bibliography should be formatted as follows: Author. (Year). Title of work. Source/publisher. DOI/URL (if available)
For example: Hodovaniuk, T.L. (2010). Individualised learning in higher education. Kyiv: Drahomanov National Pedagogical University. DOI/URL
Vancouver citation style
Citations in the text
In the Vancouver style, sources are indicated by numerical indices in round or square brackets. Each source is assigned a number when it is first mentioned, and this number is used throughout the text.
References are placed immediately after the corresponding statement:
- “The study showed a significant connection...” (1).
- “This issue is analysed in detail by Smith J.” [2].
If several sources are used in a text fragment, they are separated by commas or a range, in accordance with the order in the list of references:
For example: “This approach has been confirmed by other researchers” (3, 4-7).
Formatting the reference list
In Vancouver style, sources are listed in the order in which they are first mentioned in the text. Each reference has its own Arabic number corresponding to the citation number. Sources are described according to the established structure: author's surname and initials, title of the work, journal title (abbreviated), year, volume, issue number and pages.
For example:
- Smith J, Johnson M. The impact of digital transformation on communication in education. Educ Res J. 2020;15(3):123-130.
- Patel A, Sharma R. Role of technology in modern education. J Educ Technol. 2019;22(4):50-60.
Chicago citation style
The Chicago style (Chicago Manual of Style) is one of the most flexible formats for referencing and is widely used in the humanities and social sciences. This style has two citation systems: Notes and Bibliography and Author-Date.
Notes and Bibliography system
This format is most often used in the humanities – history, philology, cultural studies, art history. References in the text are given as footnotes marked with a superscript. After that, full information about the source is indicated at the bottom of the page.
- Citation in the text: “This issue is covered in detail in contemporary research.”¹
- Example in footnote: John Smith, Digital Learning Strategies (New York: Academic Press, 2020).
The list of references is placed at the end of the work in alphabetical order, repeating all the source information.
Author-Date System
This system is more commonly used in the social sciences. It is similar to APA, as references in the text are given in the format Author, year, sometimes with page number.
For example: (Smith 2020, 45)
A bibliography is placed at the end of the work, arranged in alphabetical order.
Common mistakes in citation formatting
Incorrect citation in the text
From time to time, there are situations when key bibliographic data is missing from citations – the author's name, year of publication or page number. Errors with quotation marks, incorrect use of italics for titles, and failure to observe spaces around punctuation marks or brackets are also common.
Incorrect data in the bibliography
The list of sources may contain incomplete entries or incorrect formatting that does not meet the requirements of the chosen style. Sometimes there is a discrepancy between the citations in the text and the bibliography: some sources are mentioned but not included in the list, or vice versa.
Plagiarism
Plagiarism is a serious violation, where the text or ideas of other authors are copied without reference to the original source. Excessive use of direct quotations can also reduce the uniqueness of the work and create the impression of a lack of independent analysis.
When preparing your diploma, you need to familiarise yourself with the formatting requirements, which may vary depending on your field, department or university. This will help you save time on making the necessary adjustments and will have a positive impact on the uniqueness of your work, as well as its overall assessment.
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