Bear, F. E. (1964). Chemistry of the soil (2nd ed.). Oxford & IBH Publishing Co. Pvt. Ltd..
Cita Chicago (17th ed.)Bear, Firman E. Chemistry of the Soil. 2nd ed. New Delhi ; Bombay ; Calcutta: Oxford & IBH Publishing Co. Pvt. Ltd., 1964.
Cita MLA (9th ed.)Bear, Firman E. Chemistry of the Soil. 2nd ed. Oxford & IBH Publishing Co. Pvt. Ltd., 1964.
Atenció: Aquestes cites poden no estar 100% correctes.