Sagarin, B. J., & Lawler-Sagarin, K. A. (2005). Critically evaluating competing theories: An exercise based on the Kitty Genovese murder. Teaching of Psychology, 32(3), 167–169. https://doi.org/10.1207/s15328023top3203_8
What is a DOI?
Some library databases, such as PsycARTICLES and PsycINFO, list a Digital Object Identifier (DOI) for individual articles. A DOI is a unique identifying number for an article. In the database record for an article, you will see an element that looks like this, which you should include at the end of your APA reference, preceded by "https://doi.org/":
This link will allow a reader to link to doi.org for more information about the article.
However, the APA Style Guide to Electronic References (2012, p. 5) notes that it is still acceptable to use the older style of DOI format in a citation, for example:
Amidzic, O., Riehle, H. J., & Elbert, T. (2006). Toward a psychophysiology of expertise: Focal magnetic gamma bursts as a signature of memory chunks and the aptitude of chess players. Journal of Psychophysiology, 20(4), 253-258. doi:10.1027/0269-8803.20.4.253
APA Style® calls for a list of references instead of a bibliography.
The requirements of a reference list are that all references cited in the text of a paper must be listed alphabetically by first author's last name in the list of references and that all references listed must be cited within the text.
A bibliography, however, typically includes resources in addition to those cited in the text and may include annotated descriptions of the items listed.
In general, the list of references is double-spaced and listed alphabetically by first author's last name. For each reference, the first line is typed flush with the left margin, and any additional lines are indented as a group a few spaces to the right of the left margin (this is called a hanging indent).
APA Publications and Communications Board Working Group on Journal Article Reporting Standards.
(2009). Reporting standards for research in psychology: Why do we need them? What might
they be? American Psychologist, 63, 839–851. doi:10.1037/0003-066X.63.9.839