American Discoglossoid Toad (Ascaphus truei: Dickerson, Mary C. 1906. The Frog Book; North American Toads and Frogs, with Study of the Habits and Life Histories of Those of the Northeastern States. Doubleday, Page & Company, New York, New York. 253pp.); American Bell Toad (Ascaphus truei: Storer, Tracy I. 1925. A synopsis of the amphibia of California. University of California Publications in Zoology (27):1-342); American Bell Toad (Ascaphus truei: Wright, Anna Allen, and Alex Hazen Wright. 1933. Handbook of frogs and toads. The frogs and toads of the United States and Canada Comstock Publishing Associates, Ithaca, NY. xi+231pp.); American Ribbed Toad (Ascaphus truei: Wright, Anna Allen, and Alex Hazen Wright. 1933. Handbook of frogs and toads. The frogs and toads of the United States and Canada Comstock Publishing Associates, Ithaca, NY. xi+231pp.); Bell's Toad (Ascaphus truei: Vincent, W. S. 1947. A check list of amphibians and reptiles of Crater Lake National Park. Nature Notes from Crater Lake 13():19–22); Tailed Frog (Ascaphus truei: Schmidt, Karl P. 1953. A Check List of North American Amphibians and Reptiles. 6th Edition. University of Chicago Press, Chicago, Illinois. 280pp.); California Tailed Frog (Ascaphus truei californicus: Schmidt, Karl P. 1953. A Check List of North American Amphibians and Reptiles. 6th Edition. University of Chicago Press, Chicago, Illinois. 280pp.); Olympic Tailed Frog (Ascaphus truei truei: Schmidt, Karl P. 1953. A Check List of North American Amphibians and Reptiles. 6th Edition. University of Chicago Press, Chicago, Illinois. 280pp.); Pacific Tailed Frog (Ascaphus truei: Collins, Joseph T. and Travis W. Taggart. 2009. Standard Common and Current Scientific Names for North American Amphibians, Turtles, Reptiles, and Crocodilians. 6th ed. The Center for North American Herpetology, Lawrence, Kansas. 44pp.);