Cita APA (7a ed.)

Copeland, R. W. (1979). How children learn mathematics: Teaching implications of Piaget's research (3rd ed.). Macmillan.

Cita Chicago Style (17a ed.)

Copeland, Richard W. How Children Learn Mathematics: Teaching Implications of Piaget's Research. 3rd ed. New York: Macmillan, 1979.

Cita MLA (9a ed.)

Copeland, Richard W. How Children Learn Mathematics: Teaching Implications of Piaget's Research. 3rd ed. Macmillan, 1979.