Gaya APA

Greenland, D., Lal, R. (1981). Soil Conservation & Management in the Humid Tropics . new york: John Wiley & Sons.

Gaya MLA

Greenland, D.J.., Lal, R. "Soil Conservation & Management in the Humid Tropics". new york: John Wiley & Sons, 1981. Teksbook.