Gaya APA

Swanson, C, P., Modgil, S. (1974). Piagetian research a handbook of recent studies . New York: New York: Humanities Press; 1974.

Gaya MLA

Swanson, Carl, P.., Modgil, Sohan. "Piagetian research a handbook of recent studies". New York: New York: Humanities Press; 1974, 1974. Text.