FAO & Zapata, F. (2004). FAO. Fertilizer and plant nutrition bulletin: 13, Use of phosphate rocks for sustainable agriculture.
Chicago-čujuhus (17. p.)FAO juo F. Zapata. FAO. Fertilizer and Plant Nutrition Bulletin: 13, Use of Phosphate Rocks for Sustainable Agriculture. 2004.
MLA-čujuhus (9. p.)FAO juo F. Zapata. FAO. Fertilizer and Plant Nutrition Bulletin: 13, Use of Phosphate Rocks for Sustainable Agriculture. 2004.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.