1. Serafini P, Tran C, Richardson A, et al. In vitro fertilization surrogacy. Assist Reprod Rev. 1994; 4: 155–161.
2. American Fertility Society. Surrogate gestational mothers: women who gestate genetically unrelated embryos. In Ethical considerations of the new reproductive technologies. Fertil Steril. 1990; 53(6): suppl 2, chap 21, 64S.
3. Utian WH, Sheean L, Godfarb JM, et al. Successful pregnancy after in vitro fertilization-embryo transfer from an infertile woman to a surrogate. N Engl J Med. 1985; 313: 1351–1352.
4. The American Fertility Society. Guidelines for gamete donation. Fertil Steril. 1993; 59(2): 15–45.
5. Serhal P. Oocyte donation and surrogacy. Br Med Bull. 1990; 46: 796–812.