Sour Orange—Julia Morton, Fruits of warm climates
Food and feed crops of the United States—Magness, J.R., G.M. Markle, C.C. Compton. 1971.
Outside Links:
Citrus—Descriptors for Citrus—Link to the publication on the International Plant Genetic Resources Institute web site
Citrus—FAO/IBPGR Technical Guidelines for the Safe Movement of Citrus Germplasm—Link to the publication on the International Plant Genetic Resources Institute web site