World Congress of WAPTT Lisboa, Portugal. (1989). Tourism education for the early 21st century: VIII World Congress of WAPTT, 16th - 19th november, 1988. Instituto de Novas Profissões.
Chicago-Zitierstil (17. Ausg.)World Congress of WAPTT Lisboa, Portugal. Tourism Education for the Early 21st Century: VIII World Congress of WAPTT, 16th - 19th November, 1988. Lisboa: Instituto de Novas Profissões, 1989.
MLA-Zitierstil (8. Ausg.)World Congress of WAPTT Lisboa, Portugal. Tourism Education for the Early 21st Century: VIII World Congress of WAPTT, 16th - 19th November, 1988. Instituto de Novas Profissões, 1989.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.