| The Turfgrass Information File
| Cookingham, Pete. 2011. 2011 USGA Turfgrass and Environmental Research Summary. p. 34.
| More Keywords | 195555 |
| The Turfgrass Information File
| Cookingham, Peter. 2010. 2010 Turfgrass and Environmental Research Summary. p. 31.
| More Keywords | 173859 |
| The Turfgrass Information File
| Cookingham, Peter. 2009. 2009 Turfgrass and Environmental Research Summary. p. 48.
| More Keywords | 159848 |