Educational Services Incorporated. African Education Program. (1963). Basic concepts of mathematics: An introductory text for teachers (Prelim. ed.). Educational Services Program.
Chicago-viite (17. p.)Educational Services Incorporated. African Education Program. Basic Concepts of Mathematics: An Introductory Text for Teachers. Prelim. ed. Watertown, MA: Educational Services Program, 1963.
MLA-viite (9. p.)Educational Services Incorporated. African Education Program. Basic Concepts of Mathematics: An Introductory Text for Teachers. Prelim. ed. Educational Services Program, 1963.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.