FAO & Zapata, F. (2004). FAO. Fertilizer and plant nutrition bulletin: 13, Use of phosphate rocks for sustainable agriculture.
Cita Chicago (17th ed.)FAO i F. Zapata. FAO. Fertilizer and Plant Nutrition Bulletin: 13, Use of Phosphate Rocks for Sustainable Agriculture. 2004.
Cita MLA (9th ed.)FAO i F. Zapata. FAO. Fertilizer and Plant Nutrition Bulletin: 13, Use of Phosphate Rocks for Sustainable Agriculture. 2004.
Atenció: Aquestes cites poden no estar 100% correctes.