APA (7e ed.) Bronvermelding

Copeland, R. W. (1974). How children learn mathematics: Teaching implications of piaget's research (2nd ed.). Macmillan.

Chicago (17e ed.) Bronvermelding

Copeland, Richard W. How Children Learn Mathematics: Teaching Implications of Piaget's Research. 2nd ed. New York: Macmillan, 1974.

MLA (9e ed.) Bronvermelding

Copeland, Richard W. How Children Learn Mathematics: Teaching Implications of Piaget's Research. 2nd ed. Macmillan, 1974.