1. The development of crop production systems using best management practices;Griffith,1991
2. IFA, 2009. The global “4R” nutrient stewardship framework – developing fertilizer best management practices for delivering economic, social and environmental benefits, International Fertilizer Industry Association, Paris, France.
3. IPNI, 2012. 4R Plant Nutrition Manual: A Manual for Improving the Management of Plant Nutrition, Metric Version, (T.W. Bruulsema, P.E. Fixen, G.D. Sulewski, eds.), International Plant Nutrition Institute, Norcross, GA, USA.
4. Fixen, P.E., 2007. Can we define a global framework within which fertilizer best management practices can be adapted to local conditions? IFA International Workshop on Fertilizer Best Management Practices(FBMPs), 7-9 March 2007, Brussels, Belgium, International Fertilizer Industry Association (IFA), Paris, France.
5. The four fertilizer rights: Selecting the right source;Mikkelsen,2009