TY  - BOOK
AU  - Simonson,Michael R.
TI  - Teaching and learning at a distance: foundations of distance education 
SN  - 9780132487313 (papel alcalino)
AV  - LC5800 T435 2012
PY  - 2012///
CY  - Boston
PB  - Allyn and Bacon
KW  - Educación a distancia
ER  -