TY  - RPRT
TI  - Tangible self-reinforcement in self-directed behavior modification projects.
AU  - I Kirsch
PY  - 1978
DO  - 10.2466/pr0.1978.43.2.455
UR  - https://pubmed.ncbi.nlm.nih.gov/724893/
ID  - 724893
ER  -