Altan, Michel, Fokko Bosker, Elena Cavagnaro, and Klaes Eringa. “Services and Sustainability. A Travellers’ Guide.: Publisher: Stenden University (ex CHN University), The Netherlands. August 2007. Paperback. 133 Pages. ISBN 978-90-809-7945-1 Reviewed by Todor Dyankov, Ph. D., International University College, Bulgaria”. European Journal of Tourism Research 1, no. 2 (October 1, 2008): 158–160. Accessed October 13, 2026. https://ejtr.vumk.eu/index.php/about/article/view/22.