Krumbein, W., & Pettijohn, F. Manual of sedimentary petrography. Appleton-Century-Crofts.
Lua i Stíl Chicago (17ú heag.)Krumbein, W.C, agus F.J Pettijohn. Manual of Sedimentary Petrography. New York: Appleton-Century-Crofts.
Lua MLA (9ú heag.)Krumbein, W.C, agus F.J Pettijohn. Manual of Sedimentary Petrography. Appleton-Century-Crofts.
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