MLA

Isaías, Pedro, et al. E-learning Systems, Environments and Approaches. Springer International Publishing, 2015.

APA

Isaías, P., Ifenthaler, D., Sampson, D. G, & Spector, J. Michael. (2015). E-Learning Systems, Environments and Approaches. Springer International Publishing.

Chicago

Isaías, Pedro, Dirk Ifenthaler, Demetrios G Sampson, and J. Michael Spector. E-Learning Systems, Environments and Approaches. : Springer International Publishing, 2015.