APA-referens

Hopken, W., & Gretzel, U. L. (2009). Information and communication technologies in tourism 2009: Proceedings of the International conference in Amsterdam, the Netherlands, 2009. Springer-Verlag/Wein.

Chicago-stil citat

Hopken, Wolfram.,ed, och Ulrike.,ed. Law Gretzel. Information and Communication Technologies in Tourism 2009: Proceedings of the International Conference in Amsterdam, the Netherlands, 2009. Netherlands: Springer-Verlag/Wein, 2009.

MLA-referens

Hopken, Wolfram.,ed, och Ulrike.,ed. Law Gretzel. Information and Communication Technologies in Tourism 2009: Proceedings of the International Conference in Amsterdam, the Netherlands, 2009. Springer-Verlag/Wein, 2009.