TY  - BOOK
AU  - Skinner,B.F.
TI  - Contingencies of reinforcement: a theoretical analysis 
T2  - The Century psychology series
SN  - 0390812803
U1  - 152 
PY  - 1969///
CY  - New York
PB  - Appleton-Century-Crofts
KW  - Operant behavior
KW  - Reinforcement (Psychology)
N1  - Bibliography: p. 299-308
ER  -