Clements, J. F., T. S. Schulenberg, M. J. Iliff, D. Roberson, T. A. Fredericks, B. L. Sullivan, and C. L. Wood (2015) The eBird/Clements checklist of birds of the world: Version 2015 http://www.birds.cornell.edu/clementschecklist/download, läst 2016-02-11
doi.org
Ainley, D. G., D. A. Manuwal, J. Adams och A. C. Thoresen (2020). Cassin's Auklet (Ptychoramphus aleuticus), version 1.0. I Birds of the World (A. F. Poole, red.). Cornell Lab of Ornithology, Ithaca, NY, USA. https://doi.org/10.2173/bow.casauk.01
