Bott, R. 1950a. Die Flusskrebse Europas (Decapoda, Astacidae). Proceedings of the Senckenberg Naturalist Society, [Frankfurt am Main: W. Kramer]. 483:1 - 36, 25 figures, 6 plates.
Bouchard, R. W. 1978d. Morphology of the Mandible in Holarctic Crayfishes (Decapoda: Astacidae and Cambaridae): Ecological and Phylogenetic Implications. Papers from the Third International Symposium on Freshwater Crayfish 3:425-452, 4 figures.
Eng, L. L., and Robert W. Daniels 1982. Life History, Distribution, and Status of Pacifastacus fortis (Decapoda, Astacidae). California Fish and Game, 68(4):197 - 212, 6 figures.
Faxon, W. 1914. Notes on the Crayfishes in the United States National Museum and The Museum of Comparative Zoology with Descriptions of New Species and Subspecies. Memoirs of The Museum of Comparative Zoology at Harvard College, 40(8):351 - 427, 13 plates.
Hobbs, H. H., Jr. 1972b. Crayfishes (Astacidae) of North and Middle America. Biota of Freshwater Ecosystems, United States Environmental Protection Agency, Water Pollution Control Research Series Identification Manual 9:x+173 pp., 115 figures. [Reprinted 1976, see H. H. Hobbs, Jr., 1976a.