W. G. Weisburg, J. G. Tully, D. L. Rose, J. P. Petzel, H. Oyaizu, D. Yang, L. Mandelco, J. Sechrest, T. G. Lawrence, J. Van Etten, J. Maniloff and C. R. Woese, “A Phylogenetic Analysis of the Mycoplasmas: Basis for Their Classification,” Journal of Bacteriology, Vol. 171, No. 12, 1989, pp. 6455-6467.
 A. A. Abu-Zeid, A. A. Kishtah and E. M. Khalil, “Isolation and Culturing of Spìroplasma citri Associated with Stubborn Disease of Citrus in Egypt,” Journal of Phytopathology, Vol. 20, No. 2, 1988, pp. 139-140.
 E. Sheta, E. S. Salem, A. M. Abou-Zeid, M. Osman, M. A. Shafik and A. El-Hawari, “Development of a Citrus Certification Program in Egypt,” Proceedings of the 15th Conference of the International Organization of Citrus Virologists (IOCV), Riverside, 3-6 November 2004, pp. 321-329.
 X. Foissac, C. Saillard, J. Gandar, L. Zreik and M. J. Bové, “Spiralin Polymorphism in Strains of Spiroplasma citri Is Not Due to Differences in Posttranslational Palmitoylation,” Journal of Bacteriology, Vol. 178, 1996, pp. 2934-2940.
 R. K. Yokomi, A. F. S. Mello, M. Saponari and J. Fletcher, “Polymerase Chain Reaction Based Detection of Spiroplasma citri Associated with Citrus Stubborn Disease,” Plant Disease, Vol. 92, No. 2, 2008, pp. 253-260. doi:10.1094/PDIS-92-2-0253