URLDate
Verified		Extra Software
Requirements
(if any)		Access
Conditions		Notes
https://web.archive.org/web/20081028205908/http://[...]12/18/2013The Lawn Institute reprint
http://turfgrasssod.org/files/file/edbf6645-a589-4[...]12/18/2013Microsoft WordTurfgrass Producers International Website reprint