TY  - BOOK
AU  - Mackenzie, Norman
AU  - Scupham, John
AU  - Postgate, Richmond
TI  - Open learning: Systems and problems in post- secondary education
SN  - 92-3-101332-7
U1  - 374 
PY  - 1975///
CY  - Paris
PB  - The Unesco Press
ER  -