Drew, J. (1967). Selected papers in soil formation and classification. S.S.S.A. Special.
Cita Chicago (17th ed.)Drew, J. Selected Papers in Soil Formation and Classification. S.S.S.A. Special, 1967.
Cita MLA (9th ed.)Drew, J. Selected Papers in Soil Formation and Classification. S.S.S.A. Special, 1967.
Atenció: Aquestes cites poden no estar 100% correctes.