How should a subsequent citation of the same source be formatted in APA style?

In APA style, subsequent citations of the same source are formatted by including the author's last name along with the year of publication. This method allows readers to easily recognize the source being referenced while maintaining clarity throughout the text. By using the author’s last name and year, the citation remains concise and helps to avoid redundancy, as the full citation information is typically provided in the reference list at the end of the document.

This approach ensures that each citation ties back to the original source without overwhelming the reader with repetitive information. It keeps the focus on the content being conveyed while providing necessary attribution.

The other options do not align with APA guidelines. For instance, using the full citation each time would clutter the text, leading to unnecessary repetition. The term "ibid." is more commonly seen in citation styles like Chicago or MLA but is not applicable in APA format. Lastly, only including the page number would not be adequate, as it would lack critical identification of the source for the reader. Thus, the correct approach is to mention the author’s last name along with the year of publication for subsequent citations.