Gaya APA

Payne, J, S., Patton, J, R. (1981). Mental Retardation (Ed. 3). Columbus: Charles E. Merrill Publishing Co..

Gaya MLA

Payne, James, S.., Patton, James, R.. "Mental Retardation". Ed. 3 Columbus: Charles E. Merrill Publishing Co., 1981. Text.