Gaya APA

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

Gaya MLA

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