Open Tourism

MLA

Egger, Roman; Gula, Igor; Walcher, Dominik, Igor Gula, and Dominik Walcher. Open Tourism. Springer Berlin Heidelberg, 2016.

APA

Egger, D., Gula, I., & Walcher, D. (2016). Open Tourism. Springer Berlin Heidelberg.

Chicago

Egger, Roman; Gula, Igor; Walcher, Dominik, Igor Gula, and Dominik Walcher. Open Tourism. : Springer Berlin Heidelberg, 2016.