TY  - BOOK
AU  - Isaias, Pedro. Spector, J Michael. Ifenthaler, Dirk ...[et al.]
TI  - E-learning systems, environments and approaches
SN  - 9783319058245
U1  - 371.334  ISA;1  R 
PY  - 2015///
CY  - New York
PB  - Springer
ER  -