Educational Services Inc. African Education Program. (1965). Secondary C one: Geometry (Prelim. ed.). Science Rresearch Associates.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रEducational Services Inc. African Education Program. Secondary C One: Geometry. Prelim. ed. Chicago, IL: Science Rresearch Associates, 1965.
एमएलए (9वां संस्करण) प्रशस्ति पत्रEducational Services Inc. African Education Program. Secondary C One: Geometry. Prelim. ed. Science Rresearch Associates, 1965.
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