APA (7e ed.) Bronvermelding

Drew, C. J., Hardman, M. L., & Logan, D. R. (1988). Mental retardation: A life cycle approach (4th ed.). Merrill.

Chicago (17e ed.) Bronvermelding

Drew, Clifford J., Michael L. Hardman, en Donald R. Logan. Mental Retardation: A Life Cycle Approach. 4th ed. Columbus, Ohio: Merrill, 1988.

MLA (9e ed.) Bronvermelding

Drew, Clifford J., et al. Mental Retardation: A Life Cycle Approach. 4th ed. Merrill, 1988.