Cita APA (7a ed.)

Petersen, M. S., & Rigby, J. K. (1970). Interpreting earth history, a manual in historical geology. W. C. Brown Co..

Cita Chicago Style (17a ed.)

Petersen, Morris S., y J. Keith Rigby. Interpreting Earth History, a Manual in Historical Geology. Dubuque, Iowa: W. C. Brown Co., 1970.

Cita MLA (8a ed.)

Petersen, Morris S., y J. Keith Rigby. Interpreting Earth History, a Manual in Historical Geology. W. C. Brown Co., 1970.