Roedel, P.M. & Ripley, W.E. (1950)
California sharks and rays. California Fish and Game Bulletin, 75, 88 pp., 65 figs
Herald, E.S. & Ripley, W.E. (1951)
The relative abundance of sharks and bat stingrays in San Francisco Bay. California Fish and Game, 37(3), 315–329