Writing a one-page paper in APA format is not an especially easy task, but it is indeed possible if you don't count the title page and references. If you must, then the paper has to contain all four major elements on one page. An APA-style paper consists of a title page with a running head, an abstract, the body of the paper with its various sections and/or in-text citations and/or footers and finally, the reference page. Type it in 12-point Times New Roman font, double-spaced, with one-inch margins on all sides.
Add the title at the top of the page in the header section with the words "Running head:". The title, in all caps with no bold font or typeface, is simply the topic or subject of the paper with the name of the writer and the university/entity for whom the paper is written. Single space this section at the top of the page and center it.
Type or write out the abstract. Center and bold the word "abstract." If all of the main elements of the APA-style paper are going to fit on one page, the abstract (summary) of the paper should be no more than two to three sentences long. If the mandatory "one-page" paper is not literal, then the abstract and the body are the only parts that will go on the single page. The title page with a "running" head and the reference page noted below can be separate for a total of three pages.
Type or write the body of the APA paper. The title should be repeated here, centered and in bold. It should consist of no more than two paragraphs, including in-text citations to be referenced in the footnote of the paper. There will be no room for sections in a one-page paper. Also, the resources should be narrowed down to only one of two references.
Reference the in-text citation or citations in the footnote section of the page or paper. You can single space the references with a double space between them and reverse indented. If the one-page mandate is not literal, then you can exchange the footnotes for a reference page, but you must still reverse indent them. Center the word "References" and bold it if you choose.