TY  - BOOK
AU  - Williams,Marcia L.
AU  - Covington,Barbara
AU  - Paprock,Kenneth
TI  - Distance learning: the essential guide 
SN  - 9781452229140 (ebook)
PY  - 1999///
CY  - Thousand Oaks, Calif., London
PB  - SAGE
KW  - Distance education
KW  - United States
KW  - Telecommunication in education
N1  - Includes bibliographical references and index
UR  - http://knowledge.sagepub.com/view/distance-learning-the-essential-guide/SAGE.xml
ER  -