APA (7th ed.) Citation

Frick, P. J., & Lahey, B. B. (1991). The nature and characteristics of attention-deficit hyperactivity disorder. School psychology review, 20(2), 163-173.

Chicago Style (17th ed.) Citation

Frick, P. J., and B. B. Lahey. "The Nature and Characteristics of Attention-deficit Hyperactivity Disorder." School Psychology Review 20, no. 2 (1991): 163-173.

MLA (9th ed.) Citation

Frick, P. J., and B. B. Lahey. "The Nature and Characteristics of Attention-deficit Hyperactivity Disorder." School Psychology Review, vol. 20, no. 2, 1991, pp. 163-173.