Cita APA (7a ed.)

Gras-Dijkstra, S., Egmond, A. N. F. v., Ras-Marees, T., & Leijten-Kupers, E. (2009). Values in tourism: An itinerary to tourism ethics. ToerBoek.

Cita Chicago Style (17a ed.)

Gras-Dijkstra, Sietske, Antionius Nicolaas Francesco van Egmond, Tineke Ras-Marees, y Esther Leijten-Kupers. Values in Tourism: An Itinerary to Tourism Ethics. Meppel: ToerBoek, 2009.

Cita MLA (9a ed.)

Gras-Dijkstra, Sietske, et al. Values in Tourism: An Itinerary to Tourism Ethics. ToerBoek, 2009.