APA (7th ed.) Citation

Kagan, J., Coles, R., & Tanner, J. M. (1972). Twelve to sixteen: Early adolescence. Norton.

Chicago Style (17th ed.) Citation

Kagan, Jerome, Robert Coles, and J. M. Tanner. Twelve to Sixteen: Early Adolescence. New York: Norton, 1972.

MLA (8th ed.) Citation

Kagan, Jerome, et al. Twelve to Sixteen: Early Adolescence. Norton, 1972.