Sahlberg, C. (1986). From Krapf to Rugambwa. Evangel.
Tohutoru Kātū Chicago (17th ed.)Sahlberg, Carl-Erik. From Krapf to Rugambwa. Nairobi: Evangel, 1986.
Tohutoro MLA (9th ed.)Sahlberg, Carl-Erik. From Krapf to Rugambwa. Evangel, 1986.
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