Yee, D., J. Sterling and D. Airola. In Memorium – Waldo Holt (1949-2007)

Deuel, B. 2007 (Ninth) Report of the Sacramento Bird Records Committee

Airola, D. and D. Kopp. Breeding Population Status and Mortality Assessment of Purple Martins in Sacramento during 2006

Clark, Jr., H.O. Predation on a Western Burrowing Owl by an apparent Prairie Falcon