Which of the following is NOT required in an APA-style citation for a journal article?

In APA style, a citation for a journal article includes specific key components to ensure that readers have the necessary information to locate the source. One of these components is the DOI (Digital Object Identifier) or URL of the article, which provides a direct link to the source. The article's title is also essential as it identifies the specific piece of research being referenced, and the journal's title is critical as it indicates where the article was published within the broader context of academic literature.

The author's affiliation, while important in the context of understanding the background and credibility of the research presented, is not a required component of the reference list citation. Instead, the focus is on the publication details such as the title of the article, the journal name, volume number, page range, and the DOI or URL when available. Therefore, omitting the author's affiliation from a citation does not violate APA style guidelines, making it the correct choice in response to the question.