Permanent Citation

Enrique Zeleny "Length of the Perpendicular from a Point to a Straight Line"
http://demonstrations.wolfram.com/LengthOfThePerpendicularFromAPointToAStraightLine/
Wolfram Demonstrations Project
Published: OptionValue[fallbackPublishDate] Part[DateValue[OptionValue[fallbackPublishDate], {MonthName, Year, Day}], 3] {MonthName, Year, Day}