TY  - BOOK
AU  - Verduin, John R. and Clark, Thomas A.
TI  - Distance education: : the foundations of effective practice
SN  - 155542306X
U1  - 374.4 
PY  - 1991///
CY  - San Francisco
PB  - ; Jossey-Bass Publishers
KW  - Distance Education
KW  - Education
ER  -