TY  - BOOK
AU  - Verduin,John R.
AU  - Clark,Thomas A.
TI  - Distance education: the foundations of effective practice 
SN  - 155542306X
AV  - LC5800 VER 1991
U1  - 374 20
PY  - 1991///
CY  - San Francisco
PB  - Jossey-Bass
KW  - Distance education
N1  - Includes bibliographical references (p. 241-267) and indexes
UR  - http://www.loc.gov/catdir/description/wiley037/90046107.html
UR  - http://www.loc.gov/catdir/toc/onix06/90046107.html
ER  -