Cita APA (7a ed.)

Neel, R. S., & Billingsley, F. F. (1989). Impact: A functional curriculum handbook for students with moderate to severe disabilities. Paul H. Brookes.

Cita Chicago Style (17a ed.)

Neel, Richard S., y Felix F. Billingsley. Impact: A Functional Curriculum Handbook for Students with Moderate to Severe Disabilities. Baltimore [etc.]: Paul H. Brookes, 1989.

Cita MLA (9a ed.)

Neel, Richard S., y Felix F. Billingsley. Impact: A Functional Curriculum Handbook for Students with Moderate to Severe Disabilities. Paul H. Brookes, 1989.