TY  - BOOK
AU  - Isaias,Pedro
TI  - E-learning systems, environments and approaches: theory and implementation 
SN  - 9783319058245
PY  - 2016///
CY  - Cham
PB  - Springer International Publishing Switzerland
KW  - Computer-assisted instruction
KW  - Educational technology
N1  - Includes bibliographical references and index
ER  -