Periodicals are published on a continuous basis and include peer-reviewed academic journals, magazines and newspapers. They can be accessed in print, online and through academic databases.
When citing, be sure to capitalize:
Author, A. A., & Author, B. B. (Date of publication). Title of article. Title of Journal, volume number(issue), page range. URL or DOI
When periodical information is missing (ie. volume number, issue number or page number) omit it from the reference.
The APA Manual recommends not including database information. However you should include a link to the DOI (digital object indentifier). The DOI is a unique number assigned to an article that will not change.
Van Tyne, D., & Gilmore, M.S. (2014). A delicate balance: Maintaining mutualism to prevent disease. Cell Host & Microbe, 16(4), 425-427. https://doi.org/10.1016/j.chom.2014.09.019
The APA Manual recommends not including database information or URLs for citations from academic databases. Therefore, articles accessed from academic databases and print versions are cited similarly.
Author(s). (Year, Month Day). Title of article. Title of Journal. Volume(Issue), Pages.
Vick, K. (2017, April 3). The home of the future. Time. 189(12). 46-51.
Manworren, R. C. & Gilson, A.M. (2015). Nurses' role in preventing prescription opioid diversion. American Journal of Nursing. 115(8). 34-40.
Hess, A. (2019, January 3). Cats who take direction. The New York Times, C1.
If you are citing an article from an online journal with a non-database URL or an online newspaper article, follow this format:
Lewis, H. (2020, January). The State of the National. The Atlantic. https://www.theatlantic.com/international/archive/2020/01/britain-national-theater-politics-challenges/603973/
Itzkoff, D. (2020, January 2). Martin Scorsese is letting go. The New York Times. https://www.nytimes.com/2020/01/02/movies/martin-scorsese-irishman.html?action=click&module=Well&pgtype=Homepage§ion=Movies