APA (7th ed.) Citation

Butterworth, G., & Harris, M. (1994). Principles of developmental psychology. Psychology Press.

Chicago Style (17th ed.) Citation

Butterworth, George, and Margaret Harris. Principles of Developmental Psychology. Hove, England: Psychology Press, 1994.

MLA (9th ed.) Citation

Butterworth, George, and Margaret Harris. Principles of Developmental Psychology. Psychology Press, 1994.