MLA

Woolf, Beverley P, et al. Intelligent Tutoring Systems. Springer Berlin Heidelberg, 2008.

APA

Woolf, B. P, Aïmeur, E., Kanade, T., Lajoie, S., Nkambou, R., & Woolf, B. Park. (2008). Intelligent Tutoring Systems. Springer Berlin Heidelberg.

Chicago

Woolf, Beverley P., Esma Aïmeur, Takeo Kanade, Susanne Lajoie, Roger Nkambou, and Beverly Park Woolf. Intelligent Tutoring Systems. : Springer Berlin Heidelberg, 2008.