Gear, J. H. S., & Pitchford, R. J. (1988). Bilharzia in South Africa (2nd ed.). Dept. of National Health and Population Development.
Lua i Stíl Chicago (17ú heag.)Gear, James H. S., agus R. J. Pitchford. Bilharzia in South Africa. 2nd ed. Pretoria: Dept. of National Health and Population Development, 1988.
Lua MLA (8ú heag.)Gear, James H. S., agus R. J. Pitchford. Bilharzia in South Africa. 2nd ed. Dept. of National Health and Population Development, 1988.
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