TY  - BOOK
AU  - Mackenzie,Norman
AU  - Postgate,Richmond
TI  - Open learning:  systems and problems in post - secondary education 
SN  - 9231013327
U1  - 378/MAC 
PY  - 1975///
CY  - Paris
PB  - The Unesco Press
KW  - Higher Education
N1  - Includes bibliographical references
ER  -