Citing means that you state the source from which arguments and quotations are taken, either in running text or in a footnote. A citation also means that you write with your own words and at the same time refer to others in your text so that the text flows smoothly. The complete reference is placed in a list so that it is clear where you have taken the information from. Further down below on this webpage are a couple of examples of how to go about writing references.
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Examples of in-text citations (in-text references) and full references
In-text citation (example):
A few researchers in the linguistics field have developed training programs designed to improve native speakers' ability to understand accented speech (Derwing, Rossiter, & Munro, 2002; Thomas, 2004). Their training techniques are based on the research described above indicating that comprehension improves with exposure to non-native speech. Derwing et al. (2002) conducted their training with students preparing to be social workers, but note that other professionals who work with non-native speakers could benefit from a similar program.
References in the reference list (example)
Derwing, T. M., Rossiter, M. J., & Munro, M. J. (2002). Teaching native speakers to listen to foreign-accented speech. Journal of Multilingual and Multicultural Development, 23(4), 245-259.
Thomas, H. K. (2004). Training strategies for improving listeners' comprehension of foreign-accented speech (Doctoral dissertation). University of Colorado.
Learn more about writing APA-references in these free officical web-guidelines: