Cita APA (7a ed.)

Eldredge, N. (1973). Systematics of Lower and Lower Middle Devonian species of the trilobite Phacops Emmrich in North America. American Museum of Natural History.

Cita Chicago Style (17a ed.)

Eldredge, Niles. Systematics of Lower and Lower Middle Devonian Species of the Trilobite Phacops Emmrich in North America. New York: American Museum of Natural History, 1973.

Cita MLA (8a ed.)

Eldredge, Niles. Systematics of Lower and Lower Middle Devonian Species of the Trilobite Phacops Emmrich in North America. American Museum of Natural History, 1973.