Folk, R. L. (1968). Petrology of sedimentary rocks. Hemphill's.
Cita Chicago (17th ed.)Folk, Robert L. Petrology of Sedimentary Rocks. Austin, Tex.: Hemphill's, 1968.
Cita MLA (8th ed.)Folk, Robert L. Petrology of Sedimentary Rocks. Hemphill's, 1968.
Atenció: Aquestes cites poden no estar 100% correctes.