Gaya APA
Patton, J, S, P, ;, J, R.
(1981).
Mental retardation
.
London:
a bell & HOWELL COMPANY.
Gaya MLA
Patton, James, S., Payne, ;, James, R..
"Mental retardation".
London:
a bell & HOWELL COMPANY,
1981.
Text.