Cita APA (7a ed.)

Petersen, M. S., & Rigby, J. K. (1978). Interpreting earth history: A manual in historical geology (2nd ed.). Wm. C. Brown.

Cita Chicago Style (17a ed.)

Petersen, Morris S., y J. Keith Rigby. Interpreting Earth History: A Manual in Historical Geology. 2nd ed. Dubuque, Iowa: Wm. C. Brown, 1978.

Cita MLA (8a ed.)

Petersen, Morris S., y J. Keith Rigby. Interpreting Earth History: A Manual in Historical Geology. 2nd ed. Wm. C. Brown, 1978.