APA (7th ed.) Citation

Kotziampasis, I., Chalmers, A., & Sidwell, N. Portals: Increasing Visibility in Virtual Worlds.

Chicago Style (17th ed.) Citation

Kotziampasis, Ioannis, Alan Chalmers, and Nathan Sidwell. Portals: Increasing Visibility in Virtual Worlds.

MLA (9th ed.) Citation

Kotziampasis, Ioannis, et al. Portals: Increasing Visibility in Virtual Worlds.