TY  - BOOK
AU  - Holmberg,Borje
AU  - Keegan,Desmond
AU  - Sewart,David
TI  - Distance education: international perspectives 
SN  - 0312213190
U1  - 371.3 
PY  - 1983///
CY  - London
PB  - Croom Helm
KW  - Distance education
KW  - Instructional systems
KW  - Design
KW  - Teaching
N1  - Includes bibliographical indexes
ER  -