APA

Gaffney E. S., . (1976). Cranial morphology of the European Jurassic turtles Portlandemys and Plesiochelys. New York: American Museum of Natural History.

Chicago

Gaffney Eugene S, . 1976. Cranial morphology of the European Jurassic turtles Portlandemys and Plesiochelys. New York: American Museum of Natural History.

Harvard

Gaffney E. S., . (1976). Cranial morphology of the European Jurassic turtles Portlandemys and Plesiochelys. New York: American Museum of Natural History.

MLA

Gaffney Eugene S, . Cranial morphology of the European Jurassic turtles Portlandemys and Plesiochelys. New York: American Museum of Natural History. 1976.