Gaya APA

Group, F, W. (1992). World and Regional Supply and Demand Balances for Nitrogen, Phosphate and Potash, 1990/91-1996/97 . : The World Bank.

Gaya MLA

Group, Fertilizer, Working. "World and Regional Supply and Demand Balances for Nitrogen, Phosphate and Potash, 1990/91-1996/97". : The World Bank, 1992. Text.