Cita APA (7th ed.)
Ludman, A., & Marshak, S. (2010). Laboratory manual for introductory geology. W.W. Norton.
Cita Chicago (17th ed.)
Ludman, Allan, i Stephen Marshak. Laboratory Manual for Introductory Geology. New York: W.W. Norton, 2010.
Cita MLA (9th ed.)
Ludman, Allan, i Stephen Marshak. Laboratory Manual for Introductory Geology. W.W. Norton, 2010.
Atenció: Aquestes cites poden no estar 100% correctes.