Information on what to include in an appendix and how to format it can be found in Section 2.14 of the APA manual (pp. 41-42).
The manual states that each appendix should begin on a separate page at the end of the paper (i.e., after the references, footnotes, tables, etc.). All appendices require a label (e.g., "Appendix", "Appendix A") and a title which should be bolded and centred on separate lines at the top of the page (p. 41).
Note
All information and page number references are based on the 7th edition of the Publication Manual of the American Psychological Association (2020).
