TY  - BOOK
AU  - MacKenzie,Norman Ian
AU  - Postgate, Richmond
TI  - Open learning: System and problems in post-secondary education 
SN  - 9231013327
AV  - LC6233 M32
PY  - 1975///
CY  - Paris
PB  - UNESCO
KW  - Extensión universitaria
KW  - Estudio de casos
N1  - "a report prepared with the support of the ford foundation"
ER  -