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You can use footnotes to place detailed explanatory or supplementary information at the bottom of a page; use in-text references to cite others' works. Use superscript numerals for footnote numbering. You can also place explanations, details, contradictions, and examples in the text rather than in footnotes. Footnote numbers are printed outside commas and periods but inside colons, semicolons, and dashes.

The experiment took place in April,1 and it was evaluated in May.2
We discussed these three stages of writing7: prewriting, writing, and revising.

Mark the footnotes to tables in NREL reports with superscript letters: a, b, c, etc.