What are the key guidelines for formatting a one-page paper in APA format?

The key guidelines for formatting a one-page paper in APA format include using 1-inch margins on all sides, a 12-point font size in Times New Roman, double-spacing the entire paper, and including a title page with a running head and page number. Additionally, the paper should have a clear introduction, body paragraphs with proper citations, and a concise conclusion.