13.		A hierarchical model of perceived value of group-oriented travel experiences to major events and its influences on satisfaction and future group-travel intentions / Jamie Carlson, Philip J. Rosenberger III and Mohammad M. Rahman Autor: Carlson, Jamie Coautor: ; Rosenberger III, Philip J. Rahman, Mohammad COTA(S): RE-1562
14.		Orbis. Services pour le touriste en groupe et individuel. Visites regulières / Bureau Polonais de Voyages "Orbis" Data Publicação: 1975 COTA(S): Fl-PL.2390.B