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Alva, A.K., S. Paramasivam, A. Fares, T.A. Obreza and A.W. Schumann, 2006. Nitrogen best management practice for citrus trees: II. Nitrogen fate, transport and components of N budget. Sci. Hortic., 109: 223-233.
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Ferguson, J.J., F.S. Davies, D.P.H. Tucker, A.K. Alva and T.A. Wheaton, 1995. Fertilizer Guidelines. In: Nutrition of Florida Citrus Trees, Tucker, D.P.H., A.K. Alva, L.K. Jackson and T.A. Wheaton (Eds.). University of Florida, Gainesville, pp: 21-25.

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Maust, B.E. and J.G. Williamson, 1994. Nitrogen nutrition of containerized citrus nursery plants. J. Am. Soc. Hortic. Sci., 119: 195-201.
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Obreza, T.A., 1992. Citrus Grove Leaf Tissue and Soil Testing: Sampling, Analysis and Interpretation. Cooperative Extension Service, University of Florida, Institute of Food and Agricultural Sciences, Florida, pp: 1-4.

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Obreza, T.A., Z. Mongi and A.H. Edward, 2008. Soil and Leaf Tissue Testing. In: Nutrition of Florida Citrus Trees, Obreza, T.A. and K.T. Morgan (Eds.). 2nd Edn., UF-IFAS, Gainesville, FL., USA., pp: 24-32.

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Robert, E.R., T.A. Obreza and J.B. Sherrod, 1999. Yield and relative cost of controlled-release fertilizer on young bearing citrus tress. Proc. Fla. State Hortic. Soc., 112: 46-50.

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Thompson, T.L. and S.A. White, 2004. Nitrogen and phosphorus fertilizer requirements for young, bearing microsprinkler-irrigated citrus, 2004 report. http://www.azda.gov/CDP/NewCBC/ACRC/ACRC2003Research/2003-02.pdf.

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Zekri, M. and T.A. Obreza, 2003. Plant Nutrients for Citrus Trees. Extension Service Fact Sheet SL 200. Florida Cooperative Extension Service, Institute of Food and Agricultural Sciences, University of Florida, Gainesville.