1. AOAC (1995). Official Methods of Analysis. 14th Edition, Association of Official Analytical Chemists, Washington DC.
2. Bray RH, Kurtz LT (1945). Determination of total organic and available forms of phosphorus in soil. Soil Science Society of America Journal 59:39-45.
3. Chapman HD (1973). Zinc. In: Diagnostic Criteria for Plants and Soil. Quality Printing Company, Abilene, Texas pp. 484-499
4. Cruz CD, Carneiro PCS (2006). Modelos biomtricos aplicados ao melhoramento gentico, v.2. Segunda edicin. Ed. UFV, Universidade Federal de Viosa, Viosa, MG 585 p.
5. Falconer DS, Mackay TFC (1996). Introduction to Quantitative Genetics. Benjamin Cummings, London, UK 464 p.