APA (7th ed.) Citation

Berk, L. E., & Diaz, R. M. (1992). Private speech: From social interaction to self-regulation. L. Erlbaum.

Chicago Style (17th ed.) Citation

Berk, Laura E., and Rafael M. Diaz. Private Speech: From Social Interaction to Self-regulation. Hillsdale, N.J: L. Erlbaum, 1992.

MLA (9th ed.) Citation

Berk, Laura E., and Rafael M. Diaz. Private Speech: From Social Interaction to Self-regulation. L. Erlbaum, 1992.