Graham, WJ; Foster, LB; Davidson, L; Hauke, E; Campbell, OMR (2008) Measuring progress in reducing maternal mortality. Best Practice and Research Clinical Obstetrics and Gynaecology; Vol. 22, No. 3, pp425-445
Graham, W (2002) Now or never: the case for measuring maternal mortality. Lancet, 359(9307): 701-4.
Rosenfield, A. & Maine, D. (1985) Maternal mortality - a neglected tragedy: where is the M in MCH? Lancet; ii: 83-85.
UNFPA (1998b) Issues in measuring and monitoring maternal mortality: implications for programmes. Technical and Policy Paper No.1. New York: United Nations.
WHO (1991) Maternal Mortality Ratios and Rates: A Tabulation of Available Information. Geneva: World Health Organization.