TY  - BOOK
AU  - Pedro Isa?as J. Michael Spector Dirk Ifenthaler Demetrios G. Sampson
TI  - E-Learning Systems Environments and Approaches
SN  - 9783319058252
PB  - Springer
UR  - https://link.springer.com/openurl?genre=book&isbn=978-3-319-05825-2
ER  -