APA استشهاد

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

استشهاد بنمط شيكاغو

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

MLA استشهاد

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