View these guides from APA to develop an understanding of common questions and topics. Still have questions? Ask your faculty, librarian, or Writing and Tutoring Center for further assistance.
DOI stands for Digital Object Identifier, a unique tag assigned to an article. Always include the DOI in an APA citation. But what if there is no DOI?
When using APA Professional, note that the differences between this and "student" papers are largely formatting, not content. References and in-text citations remain the same. See these resources from The American Psychological Association to write your paper in APA Style.
Owens, H., Christian, B., & Polivka, B. (2017). Sleep behaviors in traditional-age college students: A state of the science review with implications for practice. Journal of the American Association of Nurse Practitioners, 29(11), 695-703. http://dx.doi.org/10.1002/2327-6924.12520
Burgess, R. (2019). Rethinking global health: Frameworks of power. Routledge.
Centers for Disease Control and Prevention. (2021, November 18). People at high risk of developing flu-related complications. https://www.cdc.gov/flu/highrisk/index.htm
If at all possible, find and cite the original source directly. If you can't find the original source, cite the source that you found in your References list, and use "as cited in" in your in-text citation to that source. For example, if you read a work by Lyon et al. (2014) in which Rabbit (1982) was cited, and you were unable to read Rabbitt's work yourself, your in-text citation would look like this, and you would only include Lyon's source in your References list:
(Rabbitt, 1982, as cited in Lyon et al., 2014).
For more details, see Section 8.6 of the 7th edition of the APA Manual, or consult the APA's online guide: https://apastyle.apa.org/style-grammar-guidelines/citations/secondary-sources
Provide surnames and initials for up to and including 20 authors. When there are two to 20 authors, use an ampersand before the final author's name. When there are 21 or more authors, include the first 19 author's names, insert an ellipsis (but no ampersand), and then add the final author's name.
In-text citations:
Reference list:
Vos, T., Lim, S. S., Abbafati, C., Abbas, K. M., Abbasi, M., Abbasifard, M., Abbasi-Kangevari, M., Abbastabar, H., Abd-Allah, F., Abdelalim, A., Abdollahi, M., Abdollahpour, I., Abolhassani, H., Aboyans, V., Abrams, E. M., Abreu, L. G., Abrigo, M. R. M., Abu-Raddad, L. J., Abushouk, A. I., … Murray, C. J. L. (2020). Global burden of 369 diseases and injuries in 204 countries and territories, 1990–2019: A systematic analysis for the Global Burden of Disease Study 2019. The Lancet, 396(10258), 1204–1222. https://doi.org/10.1016/S0140-6736(20)30925-9
Coltrane, S. (1998). Gender and families. Pine Forge Press.
Goulding, M., & Mahar, D. (1996). Floods of fortune: Ecology and economy along the Amazon. Columbia University Press.
Egan, S. E., & Perry, D. G. (2001). Gender identity: A multidimensional analysis with implications for psychosocial adjustment. Developmental Psychology, 37(4), 451-464. https://doi.org/10.1037/0012-1649.37.4.4514
Diabetes. (2000). In The Columbia encyclopedia (6th ed., p. 2533). New York, NY: Columbia University Press.