ContourSpacing
Since Version 2.0 (released in 1991), ContourSpacing has been superseded by Contours.
Wolfram Research (1988), ContourSpacing, Wolfram Language function, https://reference.wolfram.com/language/ref/ContourSpacing.html.
Text
Wolfram Research (1988), ContourSpacing, Wolfram Language function, https://reference.wolfram.com/language/ref/ContourSpacing.html.
CMS
Wolfram Language. 1988. "ContourSpacing." Wolfram Language & System Documentation Center. Wolfram Research. https://reference.wolfram.com/language/ref/ContourSpacing.html.
APA
Wolfram Language. (1988). ContourSpacing. Wolfram Language & System Documentation Center. Retrieved from https://reference.wolfram.com/language/ref/ContourSpacing.html