Zotero is an easy to use, free, open-source citation management program with a browser version and a desktop version. The browser version works with Firefox, Chrome, and Safari, and syncs to the desktop version. Zotero works well with library databases, Google Scholar, and websites. You can also download a plugin to "cite while you write" in Word and save PDFs of articles as attachments. You get 300 MG of free storage, and can purchase more space if you need it.
Citation organizers (or reference managers) store and organize citation information for a variety of research resources for easy representation in a variety of citation styles. These programs allow you to build reference library for many information sources, including journal articles, books and book chapters, audiovisual materials, websites, and more.
Here is the general format for the APA citation of an academic journal article (examples from the Purdue OWL), along with a sample citation.
Author, A. A., Author, B. B., & Author, C. C. (Year). Title of article. Title of Periodical, volume number(issue number), pages. https://doi.org/xx.xxx/yyyy
Aoyagi, K., Santos, C. E., & Updegraff, K. A. (2018). Longitudinal associations between gender and ethnic-racial identity felt pressure from family and peers and self-esteem among African American and Latino/a youth. Journal of Youth and Adolescence, 47(1), 207–221. https://doi.org./10.1007/s10964-017-0750-0
Note: APA style requires the inclusion of a Digital Object Identifier (DOI) if the article has one. If you can't find the DOI in the article itself, you can look it up on Crossref (select "Metadata search") or ask a librarian!
More resources to help with APA: