TY  - BOOK
AU  - Yule William/
AU  - WILLIAM YULE AND JANET CARR.
TI  - BEHAVIOUR MODIFICATON FOR THE MENTALLY HANDICAPPED.
SN  - 0839117469
U1  - 362.783 
PY  - 1980///
CY  - Northe America
PB  - University Park Press
N1  - includes Appendix,References and index
ER  -