1. Kwast BE, Kidane-Mariam W, Said EM, Fowkes GFR. Report on Maternal Health in Addis Ababa. Addis Ababa University, 1984: 1, 45
2. UNICEF. The state of the world's children, Oxford: Oxford University Press, 1990: 76–86
3. Central Statistics Office. Population and Housing census preliminary report Vol 1. Addis Ababa, Ethiopia: Central Statistics Office, 1984: 53
4. Carter R, Martin J, Mayblin W, Munday M. Systems, management and change: a graphic guide. London: Paul Chapman Publishing/The Open University, 1984: 31–93