Folk, R. L. (1968). Petrology of sedimentary rocks. Hemphill's.
Lua i Stíl Chicago (17ú heag.)Folk, Robert L. Petrology of Sedimentary Rocks. Austin, Texas: Hemphill's, 1968.
Lua MLA (9ú heag.)Folk, Robert L. Petrology of Sedimentary Rocks. Hemphill's, 1968.
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