Bull, A. (1995). The economics of travel and tourism (2nd ed.). Melbourne: Longman.
Trích dẫn kiểu ChicagoBull, Adrian. The Economics of Travel and Tourism. 2nd ed. Melbourne: Longman, 1995.
Deismireacht MLABull, Adrian. The Economics of Travel and Tourism. 2nd ed. Melbourne: Longman, 1995.
Rabhadh: D'fhéadfadh nach mbeadh na deismireachtaí seo 100% cruinn i gcónaí.