Cita APA

Geological Society of America, & Geological Society of America. (1973). Geology. Colorado: Geological Society of America.

Citación estilo Chicago

Geological Society of America, y Geological Society of America. Geology. Colorado: Geological Society of America, 1973.

Cita MLA

Geological Society of America, y Geological Society of America. Geology. Colorado: Geological Society of America, 1973.