1.
Helping the Retarded : A Systematic Behavioural Approach
by Perkins, E. A., Taylor, P. ...
ISBN: 9780906054406
List Price: $30.00
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Teaching Basic Behavioural Principles : A Manual for Course Tutors Using "Helping the Retarded"
by Capie, A. C. M., Taylor, P....
ISBN: 9780906054208
List Price: $25.00
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Helping the Retarded : A Systematic Behavioural Approach
by Perkins, E. A., Taylor, P. ...
ISBN: 9780906054185
List Price: $40.00
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Helping the Retarded : Developmental Checklist
by Perkins, E. A., Taylor, P. ...
ISBN: 9780906054253
List Price: $30.00