1. Coulam CB. Recurrent pregnancy loss (foreword). In: Clinical Obstetrics and Gynecology, Volume 29, No.4. Ed. C Greenshaw. Philadelphia: Harper and Row, 1986; pp.863–864.
2. Roman E. Maternal age, pregnancy interval and spontaneous abortion. In: Spontaneous abortion and its relationship to various maternal and obstetric factors, PhD Thesis. University of London.
3. Warburton D, Strobino B. Recurrent spontaneous abortion. In: Spontaneous and Recurrent Abortion. Eds. MJ Bennett, DK Edmonds. Oxford: Blackwell Scientific Publications, 1987, pp.193–213.
4. Fraga A, Mintz G, Orozco J, Orozco JH. Sterility and fertility rates, fetal wastage and maternal morbidity in systemic lupus erythematosus. J Rheumatol 1974; 1: 293.
5. Strobino B, Fox HE, Kline J, Stein Z, Susser M, Warburton D. Characteristics of women with recurrent spontaneous abortions and women with favourable reproductive histories. Am J Publ Hlth 1986; 76: 986–991.