Harvey, S.A.; Ayabaca, P.; Bucago, M.; Djibrina, S.; Edson, W.N.; Gbangbade, S. (2004). "Skilled birth attendant competence: an initial assessment in four countries, and implications for the Safe Motherhood movement". International Journal of Gynecology and Obstetrics. 87 (2): 203–210. doi:10.1016/j.ijgo.2004.06.017. PMID15491581.
Harvey, S.A.; Ayabaca, P.; Bucago, M.; Djibrina, S.; Edson, W.N.; Gbangbade, S. (2004). "Skilled birth attendant competence: an initial assessment in four countries, and implications for the Safe Motherhood movement". International Journal of Gynecology and Obstetrics. 87 (2): 203–210. doi:10.1016/j.ijgo.2004.06.017. PMID15491581.