Educational Services Inc. African Education Program. (1966). Secondary four: Geometry (Prelim. ed.). Science Research Associates.
Lua i Stíl Chicago (17ú heag.)Educational Services Inc. African Education Program. Secondary Four: Geometry. Prelim. ed. Chicago, IL: Science Research Associates, 1966.
Lua MLA (9ú heag.)Educational Services Inc. African Education Program. Secondary Four: Geometry. Prelim. ed. Science Research Associates, 1966.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.