Cita APA (7th ed.)

Drew, C. J., & Hardman, M. L. (2007). Intellectual disabilities across the lifespan (9th ed.). Pearson/Merril/Prentice Hall.

Cita Chicago (17th ed.)

Drew, Clifford J., i Michael L. Hardman. Intellectual Disabilities Across the Lifespan. 9th ed. Upper Saddle River, N.J: Pearson/Merril/Prentice Hall, 2007.

Cita MLA (9th ed.)

Drew, Clifford J., i Michael L. Hardman. Intellectual Disabilities Across the Lifespan. 9th ed. Pearson/Merril/Prentice Hall, 2007.