Gaya APA

Beard, R, M. (1969). An Outline Of : Piaget's Developmental Psychology For Students And Teachers . New York: New York: The New American Library; 1969.

Gaya MLA

Beard, Ruth, M. "An Outline Of : Piaget's Developmental Psychology For Students And Teachers". New York: New York: The New American Library; 1969, 1969. Text.