Penggayaan APA

WADSWOERTH, Barry J. (1979). Piagets theory of cognitive development (2nd ed.). New York: Longman.

Chicago Style

WADSWOERTH, Barry J. Piagets theory of cognitive development. 2nd ed. New York: Longman, 1979. Text.

MLA Style

WADSWOERTH, Barry J. Piagets theory of cognitive development. 2nd ed. New York: Longman, 1979. Text.

Turabian Style

WADSWOERTH, Barry J. Piagets theory of cognitive development. 2nd ed. New York: Longman, 1979. Print.