TY  - BOOK
AU  - Skinner,B.F.
TI  - Cumulative record: a selection of papers 
AV  - BF21 .C868 1972
PY  - 1972///
CY  - New York
PB  - Appleton-Century-Crofts
KW  - Psychology
KW  - Human behavior
N1  - Bibliography: pages 603-604; 2
ER  -