Mock, P. (2004). "California Gnatcatcher (Polioptila californica)". The Coastal Scrub and Chaparral Bird Conservation Plan: a strategy for protecting and managing coastal scrub and chaparral habitats and associated birds in California. California Partners in Flight. Archived from the original on 2009-03-18. Retrieved 2006-03-15.
web.archive.org
Mock, P. (2004). "California Gnatcatcher (Polioptila californica)". The Coastal Scrub and Chaparral Bird Conservation Plan: a strategy for protecting and managing coastal scrub and chaparral habitats and associated birds in California. California Partners in Flight. Archived from the original on 2009-03-18. Retrieved 2006-03-15.
