World Health Organization (WHO), United Nations Children’s Fund (UNICEF), United Nations Population Fund (UNFPA). 2001.Maternal Mortality in 1995: Estimates Developed by WHO, UNICEF and UNFPA. Geneva: WHO.
Younis N, Khattab H, Zurayk H, el-Mouelhy M, Amin MF, Farag AM. 1993. A community study of gynecological and related morbidities in rural Egypt. Studies in Family Planning 24(3):175–186.
Zhu B-P, Rolfs RT, Nangle BE, Horan JM. 1999. Effect of the interval between pregnancies on perinatal outcomes. New England Journal of Medicine 340:589–594.