APA (7th ed.) Citation

Nussbaumer, A., Guetl, C., Albert, D., Helic, D., & Auer, M. E. (2009). Competence-based adaptation of learning environments in 3D Space. International Association of Online Engineering.

Chicago Style (17th ed.) Citation

Nussbaumer, A., Christian Guetl, D. Albert, D. Helic, and Michael E. Auer. Competence-based Adaptation of Learning Environments in 3D Space. International Association of Online Engineering, 2009.

MLA (9th ed.) Citation

Nussbaumer, A., et al. Competence-based Adaptation of Learning Environments in 3D Space. International Association of Online Engineering, 2009.