Gaya APA

Copeland, R, W. (1979). How children learn mathematics: teching implications of piaget's research (3rd ed.). New York: Macmillan Publishing Co., Inc..

Gaya MLA

Copeland, Richard, W.. "How children learn mathematics: teching implications of piaget's research". 3rd ed. New York: Macmillan Publishing Co., Inc., 1979. Text.