When citing a reference with two authors in text, how often should their surnames be mentioned?

In APA style, when citing a reference with two authors in-text, it is important to mention both authors' surnames every time the reference is cited. This practice ensures clarity and provides appropriate credit to each author for their contribution to the work being referenced. In citations involving two authors, the standard format is to list both surnames followed by the publication year, allowing readers to easily identify the source and its authorship. This consistent mentioning helps maintain academic integrity and assists readers in locating the original source quickly.

The other choices do not align with APA guidelines; for instance, mentioning only the first author's surname or limiting the use of surnames based on the number of authors contradicts the established format for works with two authors.