@misc{indiciae133f0136c39c, title = {Computer-programmed instruction: The relation of required interaction to practical application.}, author = {R M Tudor and D E Bostow}, year = {1991}, doi = {10.1901/jaba.1991.24-361}, url = {https://pubmed.ncbi.nlm.nih.gov/16795749/}, note = {Source identifier: 16795749} }