1.		Urlaubsreisen 1968 : reiseintensität, reisegewohnheiten der westdeutschen Bevölkerung im Zeitvergleich 1954 bis 1968 / Divo Institut Col.autor: Divo Institut
2.		Le tourisme international en techécoslovaquie en chiffres 1968 / Ministère du Commerce de la République Socialiste Tchèque Data Publicação: 1969 Col.autor: Ministère du Commerce de la République Socialiste Tchèque
3.		Physical development plan for the South Adriatic : region of Yugoslavia. Final report / United Nations Development Programe Data Publicação: 1969 Col.autor: Town Planning Institute of Croatia Town Planning Institute of Montenegro Town Planning Institute of Bosnia and Hercegovina
4.		Tourism in Scotland / Scottish Tourist Board Data Publicação: ca. 1969 Col.autor: Scottish Tourist Board