MLA

Panayiotopoulos, Themis, et al. Intelligent Virtual Agents. Springer Berlin / Heidelberg, 2005.

APA

Panayiotopoulos, T., Aylett, R., Ballin, D., Gratch, J., Kanade, T., Olivier, P.Panayiotopoulos, T., & Rist, T. (2005). Intelligent Virtual Agents. Springer Berlin / Heidelberg.

Chicago

Panayiotopoulos, Themis, Ruth Aylett, Daniel Ballin, Jonathan Gratch, Takeo Kanade, Patrick Olivier, Themistoklis Panayiotopoulos, and Thomas Rist. Intelligent Virtual Agents. : Springer Berlin / Heidelberg, 2005.