APA
, National Research Council (U.S.), . (1993). Factors affecting contraceptive use in Sub-Saharan Africa. Washington, D.C: National Academy Press.
Chicago
, National Research Council (U.S.), . 1993. Factors affecting contraceptive use in Sub-Saharan Africa. Washington, D.C: National Academy Press.
Harvard
, National Research Council (U.S.), . (1993). Factors affecting contraceptive use in Sub-Saharan Africa. Washington, D.C: National Academy Press.
MLA
, National Research Council (U.S.), . Factors affecting contraceptive use in Sub-Saharan Africa. Washington, D.C: National Academy Press. 1993.