WILLIAMS, C. Climate soil and crop production in the humid tropics. Oxfor Univ.Press.
Chicago-referens (17:e uppl.)WILLIAMS, C.N. Climate Soil and Crop Production in the Humid Tropics. Oxfor Univ.Press.
MLA-referens (8:e uppl.)WILLIAMS, C.N. Climate Soil and Crop Production in the Humid Tropics. Oxfor Univ.Press.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.