Educational Services Inc. African Education Program. (1964). Mathematics secondary two: Real numbers, graphing, similar figures and trigonometry (Prelim. ed.). ESI.
Citazione stile Chigago Style (17a edizione)Educational Services Inc. African Education Program. Mathematics Secondary Two: Real Numbers, Graphing, Similar Figures and Trigonometry. Prelim. ed. Watertown, MA: ESI, 1964.
Citatione MLA (9a ed.)Educational Services Inc. African Education Program. Mathematics Secondary Two: Real Numbers, Graphing, Similar Figures and Trigonometry. Prelim. ed. ESI, 1964.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.