International Union of Official Travel Organizations & World Tourism Organization. (1975). Aims, activities and fields of competence of national tourists organizations. [IUOTO].
Chicago-referens (17:e uppl.)International Union of Official Travel Organizations och World Tourism Organization. Aims, Activities and Fields of Competence of National Tourists Organizations. Geneva: [IUOTO], 1975.
MLA-referens (9:e uppl.)International Union of Official Travel Organizations och World Tourism Organization. Aims, Activities and Fields of Competence of National Tourists Organizations. [IUOTO], 1975.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.