Hudak, P. F. (2009). Physical geology: Laboratory manual (Seventeenth edition.). Stipes Publishing L.L.C.
Cita Chicago (17th ed.)Hudak, Paul F. Physical Geology: Laboratory Manual. Seventeenth edition. [Place of publication not identified]: Stipes Publishing L.L.C, 2009.
Cita MLA (9th ed.)Hudak, Paul F. Physical Geology: Laboratory Manual. Seventeenth edition. Stipes Publishing L.L.C, 2009.
Atenció: Aquestes cites poden no estar 100% correctes.