TY  - BOOK
AU  - Isaias, P; Spector, J M; Ifenthaler, D; Sampson, D G
TI  - E-learning systems, environments and approaches: Theory and implementation
SN  - 9783319058245
PY  - 2015///
CY  - Heidelberg
PB  - Springer
KW  - e-learning
ER  -