Provide additional, but not wholly relevant information, in explanatory notes. You can use these explanatory notes to lead your reader to other sources that expand on a point you make.
Attribute the source of a figure, chart, table or large quotation of more than 500 words with a copyright note. Contact the publisher to get copyright permissions before using material in this fashion. Include a copy of the letter giving you permission when you submit your document.
Place superscript numbers within your text. These numbers must appear directly following the information that you want to expand upon or that you need to cite. Insert the numbers after the punctuation mark if there is a comma, period or question mark. For hyphens, insert the number before the hyphen. Most word processing programs contain an automatic numbering system for endnotes.
Format the endnotes. In APA style, the endnote section is the last section of the document. Endnotes must begin on a new page. All text on this page must be double-spaced. At the top of the page, type "Footnotes" and center the text. Indent the first line of each endnote by pressing the "tab" key. Explanatory notes typically begin "See Author (year of publication) for a more detailed discussion of ...". Copyright notes begin with the word "from" then include a complete citation for the source, following APA reference format. These notes end with the phrase "reprinted with permission."