Modgil, S. (1974). Piagetian research: A handbook of recent studies. NFER [distributed in the U.S.A. by Humanities Press, New York].

Modgil, Sohan. Piagetian Research: A Handbook of Recent Studies. Windsor: NFER [distributed in the U.S.A. by Humanities Press, New York], 1974.

Modgil, Sohan. Piagetian Research: A Handbook of Recent Studies. NFER [distributed in the U.S.A. by Humanities Press, New York], 1974.