TY  - RPRT
TI  - CONTROLLING STUDENT RESPONSES THROUGH PROGRAMMED VISUAL PRESENTATIONS.
AU  - G L GROPPER
PY  - 1964
DO  - 10.2466/pms.1964.18.3.703
UR  - https://pubmed.ncbi.nlm.nih.gov/14172515/
ID  - 14172515
ER  -