Murphy, Michael A. The Aptian-Cenomanian members of the Ammonite genus Tetragonites / by Michael A. Murphy. - Berkeley ; Los Angeles : University of California Press, 1967. - 92 p. illus. ; 26 cm. - University of California publications in geological sciences, v. 69 . Bibliography: p. 77-78. Subjects--Topical Terms: Tetragonites.Paleontology--Cretaceous.