APA (7th ed.) Zitazioa
Folk, R. L. (1968). Petrology of sedimentary rocks. Hemphill.
Chicago Style (17th ed.) Zitazioa
Folk, Robert L. Petrology of Sedimentary Rocks. Austin: Hemphill, 1968.
MLA (9th ed.) Zitazioa
Folk, Robert L. Petrology of Sedimentary Rocks. Hemphill, 1968.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.