References
- Akoglu, T. (1974, January 23). Prof. Walter Hunziker. Dunya – Daily Newspaper, Istanbul.
- Akoglu, T. (1963, September 14). Prof. Kurt Krapf. Cumhuriyet – Daily Newspaper, Istanbul.
- Baretje, R. (1964–1976). Bibliographie touristique, 20 Volumes, Centre d'Etudes du Tourisme. Aix-en-Provence: Université d'Aix-Marseille.
- Fédération Suisse du Tourisme & Caisse Suisse des Voyages. (1959). Festschrift fuer Prof. Walter Hunziker zum 60. Geburstag: Fremdenverkehr in Theorie und Praxis. Bern.
- Fédération Suisse du Tourisme. (1963). In memoriam Prof. Kurt Krapf. Bern: Gedenkschrift.
- Medlik, S. (2003). Dictionary of travel, tourism and hospitality. Oxford: Butterworth-Heinemann.
- Publications and documents of the Swiss Academy for Humanities and Social Sciences, Bern (1946–2015).
- Spode, H. (2009). Tourism research and theory in German speaking countries. Bingley: Emerald.