Παραπομπή APA

Ludman, A., & Marshak, S. (2010). Laboratory manual for introductory geology. W.W. Norton.

Παραπομπή Chicago Style

Ludman, Allan, και Stephen Marshak. Laboratory Manual for Introductory Geology. New York: W.W. Norton, 2010.

Παραπομπή MLA

Ludman, Allan, και Stephen Marshak. Laboratory Manual for Introductory Geology. W.W. Norton, 2010.