Congress of the Association Internationale d' Experts Scietifiques du Tourisme Wales. (1981). Leisure, recreation, tourism: Proceedings of the 31st congress of the Association Internationale d' Experts Scientifiques du Tourisme, Wales, 13-19 September 1981. AIEST.
Trích dẫn kiểu Chicago (xuất bản lần thứ 7)Congress of the Association Internationale d' Experts Scietifiques du Tourisme Wales. Leisure, Recreation, Tourism: Proceedings of the 31st Congress of the Association Internationale D' Experts Scientifiques Du Tourisme, Wales, 13-19 September 1981. Berne, Switzerland: AIEST, 1981.
Trích dẫn kiểu MLA (xuất bản lần thứ 9)Congress of the Association Internationale d' Experts Scietifiques du Tourisme Wales. Leisure, Recreation, Tourism: Proceedings of the 31st Congress of the Association Internationale D' Experts Scientifiques Du Tourisme, Wales, 13-19 September 1981. AIEST, 1981.