APA (7th ed.) Citation

Hagen, J. W. (1986). Development during middle childhood: The years from 6 to 12, by W. A. Colins. Contemporary psychology, 31(12), 936-938.

Chicago Style (17th ed.) Citation

Hagen, J. W. "Development During Middle Childhood: The Years from 6 to 12, by W. A. Colins." Contemporary Psychology 31, no. 12 (1986): 936-938.

MLA (8th ed.) Citation

Hagen, J. W. "Development During Middle Childhood: The Years from 6 to 12, by W. A. Colins." Contemporary Psychology, vol. 31, no. 12, 1986, pp. 936-938.