APA

Roper C. F. E., Sweeney M. J., . (1978). A catalog of the type-specimens of recent Cephalopoda in the National Museum of Natural History. Washington, DC: Smithsonian Inst. Press.

Chicago

Roper Clyde F E, Sweeney Michael J, . 1978. A catalog of the type-specimens of recent Cephalopoda in the National Museum of Natural History. Washington, DC: Smithsonian Inst. Press.

Harvard

Roper C. F. E., Sweeney M. J., . (1978). A catalog of the type-specimens of recent Cephalopoda in the National Museum of Natural History. Washington, DC: Smithsonian Inst. Press.

MLA

Roper Clyde F E, Sweeney Michael J, . A catalog of the type-specimens of recent Cephalopoda in the National Museum of Natural History. Washington, DC: Smithsonian Inst. Press. 1978.