Finkelstein, M., Z. Kuspa, N. F. Snyder, og N. J. Schmitt (2020). California Condor (Gymnogyps californianus), version 1.0. I Birds of the World (P. G. Rodewald, red.) Cornell Lab of Ornithology, Ithaca, NY, USA. https://doi.org/10.2173/bow.calcon.01
Myra E. Finkelstein, Daniel F. Doak, Daniel George, Joe Burnett, Joseph Brandt, Molly Church, Jesse Grantham, Donald R. Smith: Lead poisoning and the deceptive recovery of the critically endangered California condor. In: Proceedings of the National Academy of Sciences of the United States of America. Bd. 109, Nr. 28, 2012, S. 11449–11454, doi:10.1073/pnas.1203141109
U.S. Fish and Wildlife Service: California Condor (Gymnogyps californianus). 5-Year Review: Summary and Evaluation. USFWS, Pacific Region, Portland (OR) 2013 (PDF 2,2 MB), S. 3 f.
