International Potash Intitute. (1982). Optimizing yields the role of fertilizers (Primera edición.). International Potash Intitute.
Cita Chicago (17th ed.)International Potash Intitute. Optimizing Yields the Role of Fertilizers. Primera edición. Bern: International Potash Intitute, 1982.
Cita MLA (8th ed.)International Potash Intitute. Optimizing Yields the Role of Fertilizers. Primera edición. International Potash Intitute, 1982.
Atenció: Aquestes cites poden no estar 100% correctes.