Gaya APA

Fertility, I, F, S. (1985). Nitrogen Management in Farming Systems in Humid and Subhumid Tropics . Netherland: International Institute of Tropical Agriculture.

Gaya MLA

Fertility, Institute, For, Soil. "Nitrogen Management in Farming Systems in Humid and Subhumid Tropics". Netherland: International Institute of Tropical Agriculture, 1985. Text.