Forrest, H., 1959. Taxonomic studies on the Hydras of North America. VII. Description of Chlorohydra hadleyi, new species, with a key to the North American species of Hydras. Am. Midl. Nat. 62 2: 440-448.
Taxonomic Studies on the Hydras of North America. VII. Description of Chlorohydra hadleyi, new species, with a Key to the North American Species of Hydras