Govindasamy, Pavalavalli, M. Kathryn Stewart, Shea O. Rutstein, J. Ties Boerma, and A. Elisabeth Sommerfelt. 1993. High-risk birth and maternity care. DHS Comparative Studies No. 8. Columbia, Maryland, USA: Macro International. Available at http://dhsprogram.com/pubs/pdf/CS8/CS8.pdf.