Kennedy, W. J., Cobban, W. A., & Landman, N. H. (1999). The heteromorph ammonite Didymoceras Cochleatum (Meek and Hayden, 1858), from the Pierre Shale of South Dakota and Wyoming.
Chicago Style (17th ed.) CitationKennedy, William J., William A. Cobban, and Neil H. Landman. The Heteromorph Ammonite Didymoceras Cochleatum (Meek and Hayden, 1858), from the Pierre Shale of South Dakota and Wyoming. New York, NY, 1999.
MLA (9th ed.) CitationKennedy, William J., et al. The Heteromorph Ammonite Didymoceras Cochleatum (Meek and Hayden, 1858), from the Pierre Shale of South Dakota and Wyoming. 1999.
Warning: These citations may not always be 100% accurate.