TY  - BOOK
AU  - Cleveland-Innes,M.
AU  - Garrison,D.R.
TI  - An introduction to distance education: understanding teaching and learning in a new era 
SN  - 9780415995986 (papel alcalino)
AV  - LC5800 I598
U1  - 371.35 22
PY  - 2010///
CY  - New York
PB  - Routledge
KW  - Educación a distancia
ER  -