APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

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

MLA (9th ed.) Citation

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