APA (7e ed.) Bronvermelding

Copeland, R. W. (1974). How children learn mathematics: Teaching implications of Piaget's research (2e édition.). Macmillan.

Chicago (17e ed.) Bronvermelding

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

MLA (8e ed.) Bronvermelding

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