TY  - BOOK
AU  - Williams,Marcia L.
AU  - Covington,Barbara
AU  - Paprock,Kenneth
TI  - Distance learning: the essential guide 
SN  - 0761914412 :
U1  - 371.35 
PY  - 1999///
CY  - Thousand Oaks
PB  - SAGE
KW  - Distance education
KW  - United States
KW  - Telecommunication
KW  - education
N1  - Includes bibliographical references and index
ER  -