APA
Beirne-Smith M., Ittenbach R. & Beirne-Smith M. (1994). Mental Retardation. New York: Merrill Publishers.
Chicago
Beirne-Smith Mary, Ittenbach Richard and Beirne-Smith Mary. 1994. Mental Retardation. New York: Merrill Publishers.
Harvard
Beirne-Smith M., Ittenbach R. and Beirne-Smith M. (1994). Mental Retardation. New York: Merrill Publishers.
MLA
Beirne-Smith Mary, Ittenbach Richard and Beirne-Smith Mary. Mental Retardation. New York: Merrill Publishers. 1994.