1. Abd-El-Rehim, M. A., F. M.Kitat, M. A.El-Sahrigy & L. G.Samaan, 1978. The use of serological and biochemical methods in predictions of the degree of genotypic relationships in some Citrus species. Egypt. J. Genet. Cytol. 7: 313–723.
2. Ball Ellen, M., 1961. Serological tests for the identification of plant viruses. The Amer. Phytopath. Soc. Committee on Plant Virology, pp 16.
3. Birger, B. & M.Blomback, 1968. Systematic association. In: Hawkes, J. G. (Ed), Chemotaxonomy and serotaxonomy, Vol. 2: 3–20. Published for the Systematics Association by Academic Press. London, New York.
4. Cameron, J. W., R. K.Soost, A. B.England & R. H.Burnett, 1966. Fruit characters of Citrus hybrids in So. California test plots. The California Citrograph 5(11): 434 and 442–450.
5. Chapot, H., 1963. The Clementine. Al Awamia 7: 1–34.