The effectiveness of bibliotherapy as an adjunct to stimulant medication in the treatment of children with attention-deficit hyperactivity disorder was investigated. Subjects were randomly assigned to the experimental group, or the control group. Parents in the experimental group received a written protocol (bibliotherapy) outlining behavioral techniques for managing oppositional child behavior. Results indicated significant differences favoring the experimental group on standardized measures of the intensity of behavior problems in the home, parental knowledge of behavioral principles, and teacher ratings of behavior. This bibliotherapy approach appears to offer an inexpensive adjunct to stimulant medication in the treatment of attention-deficit hyperactivity disorder when individual or group behavior management training is not feasible.