The American Psychological Association site offers tutorials and answers FAQs about writing papers, referencing sources, and citing sources.
Journal Article (with a doi)
Lawson, H. M., & Leck, K. (2006). Dynamics of internet dating. Social Science Computer Review, 24(2), 189-208. https://doi.org/10.1177/0894439305283402
Journal Article (without a doi)
Lawson, H. M. (2003). Controlling the wilderness: The work of wilderness officers. Society and Animals, 11(4), 329-351.
Book/eBook/Audio Book (with author and no doi)
Burrough, B. (2004). Public enemies: America’s greatest crime wave and the birth of the FBI, 1933-34. Penguin Press.
Chapter in an Edited Book (with author and doi)
Gaskew, T. (2018). Transforming the systemic humiliation of crime and justice: Reawakening Black consciousness. In D. Rothbart (Ed.), Systemic humiliation in America (pp. 131-144). Palgrave Macmillan. https://doi.org/10.1007/978-3-319-70679-5_6
Page number is required for a direct quote.
No page numbers for a direct quote? For in-text citation use para. # or Chapter #.
No date? Use (n.d.). in both the reference and in-text citation.
No author information for an article, chapter, or webpage? Use article title, chapter title, webpage title, or first few words enclosed in quotation marks and italicize the book, report, or journal title when used in manuscript.
See the Quick Answers - References page of the APA blog for more examples.