TY  - BOOK
AU  - Harry,Keith
AU  - John,Magnus
AU  - Keegan,Desmond
TI  - Distance education: new perspectives 
SN  - 0415089417
PY  - 1993///
CY  - London
PB  - Routledge
KW  - Distance education
KW  - United States
KW  - Educational technology
ER  -