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Del Amor, F. M. 2006. “Growth, Photosynthesis and Chlorophyll Fluorescence of Sweet Pepper Plants as Affected by the Cultivation Method.” Annals of Applied Biology 148 (2): 133–39. doi:10.1111/j.1744-7348.2006.00048.x.
McGrath, J.M., J. Spargo, and C.J. Penn. "Soil Fertility and Plant Nutrition." In Encyclopedia of Agriculture and Food Systems, edited by N. Van Alfen. 2nd ed. Elsevier Science & Technology, 2014.