Barbara Kus, « Least Bell's Vireo (Vireo bellii pusillus) », The Riparian Bird Conservation Plan: a strategy for reversing the decline of riparian-associated birds in California. California Partners in Flight., PRBO Conservation Science, (consulté le )
web.archive.org
Hogan, C. Michael (2008). Western poison-oak: Toxicodendron diversilobum, GlobalTwitcher, ed. Nicklas Stromberg « Archived copy » (version du sur Internet Archive)