TY  - RPRT
TI  - Token economy systems: breakdown and control.
AU  - J Hall
AU  - R Baker
PY  - 1973
DO  - 10.1016/0005-7967(73)90001-6
UR  - https://pubmed.ncbi.nlm.nih.gov/4727289/
ID  - 4727289
ER  -