Cita APA (7th ed.)

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.