APA (7th ed.) Citation

Sigel, I. E., Brodzinsky, D., & Golinkoff, R. M. (1981). New directions in Piagetian theory and practice. L. Erlbaum Associates.

Chicago Style (17th ed.) Citation

Sigel, Irving E., David Brodzinsky, and Roberta M. Golinkoff. New Directions in Piagetian Theory and Practice. Hillsdale, N.J.: L. Erlbaum Associates, 1981.

MLA (9th ed.) Citation

Sigel, Irving E., et al. New Directions in Piagetian Theory and Practice. L. Erlbaum Associates, 1981.