TY  - BOOK
AU  - MacKenzie,Norman Ian
TI  - Open learning: systems and problems in post-secondary education 
SN  - 9231013327
U1  - 370.115 
PY  - 1975///
CY  - Paris
PB  - Unesco Press
KW  - University extension
KW  - Case studies
KW  - Open learning
KW  - Distance education
N1  - Bibliography : p. 497-498
ER  -