Manual
represents an option or other value that is to be selected manually, usually by some form of interactive manipulation.
Examples
Basic Examples (1)
Use CellGrouping->Manual to override automatic cell grouping in a notebook:
Wolfram Research (2007), Manual, Wolfram Language function, https://reference.wolfram.com/language/ref/Manual.html.
Text
Wolfram Research (2007), Manual, Wolfram Language function, https://reference.wolfram.com/language/ref/Manual.html.
CMS
Wolfram Language. 2007. "Manual." Wolfram Language & System Documentation Center. Wolfram Research. https://reference.wolfram.com/language/ref/Manual.html.
APA
Wolfram Language. (2007). Manual. Wolfram Language & System Documentation Center. Retrieved from https://reference.wolfram.com/language/ref/Manual.html