TY  - BOOK
AU  - Keller, Arnold.
TI  - When Machines Teach: Designing Computer Courseware / 
SN  - 0-06-043591-7
U1  - Bv:4 
PY  - 1977///
CY  - New York-10022 : 
PB  - Harper & Row Publishers, Inc. , 
KW  - Economics
ER  -