Fekrat, S., Lutty, G. A., & Goldberg, M. F. (1998). Hemoglobinopathies. In D. R. Guyer, S. Chang, J. Shields, & W. R. Green (Eds.), RETINA-VITREOUS-MACULA: a comprehensive text (pp. 438–458). Philadelphia: WB Saunders Co.

Fekrat, S., G. A. Lutty, and M. F. Goldberg. “Hemoglobinopathies.” In RETINA-VITREOUS-MACULA: A Comprehensive Text, edited by D. R. Guyer, S. Chang, J. Shields, and W. R. Green, 438–58. Philadelphia: WB Saunders Co., 1998.

Fekrat S, Lutty GA, Goldberg MF. Hemoglobinopathies. In: Guyer DR, Chang S, Shields J, Green WR, editors. RETINA-VITREOUS-MACULA: a comprehensive text. Philadelphia: WB Saunders Co.; 1998. p. 438–58.

Fekrat, S., et al. “Hemoglobinopathies.” RETINA-VITREOUS-MACULA: A Comprehensive Text, edited by D. R. Guyer et al., WB Saunders Co., 1998, pp. 438–58.

Fekrat S, Lutty GA, Goldberg MF. Hemoglobinopathies. In: Guyer DR, Chang S, Shields J, Green WR, editors. RETINA-VITREOUS-MACULA: a comprehensive text. Philadelphia: WB Saunders Co.; 1998. p. 438–458.