The US Government Printing Office Style Manual devotes over 660 words to the topic of footnotes.1 NASA has guidance for footnote usage in its historical documents.2 The previous two sentences were taken from the Wikipedia page3 on footnotes and endnotes.
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"Chapter 15: Footnotes, indexes, contents, and outlines". U.S. Government Printing Office Style Manual. Retrieved October 26, 2015. ↩
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"A Guide to Footnotes and Endnotes for NASA History Authors". NASA History Style Guide. Retrieved March 24, 2005. ↩
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Wikipedia contributors, "Note (typography)," Wikipedia, The Free Encyclopedia, (accessed July 10, 2018). ↩