TY  - BOOK
AU  - Ayllon, Teodoro
AU  - Azrin, Nathan
AU  - Elliott, Richard M [series editor]
TI  - The Token economy
U1  - 615.851 AYL 
PY  - 1968///.
CY  - New York : 
PB  - Appleton -Century Crafts, 
KW  - Human behaviour- Institutions
ER  -