Singapore Tourist Promotion Board. Research Dept. (1976). Pleasure/vacation visitors from the U.S.A. to Singapore with special reference to visitors on group tours, 1972-1974. Singapore Tourist Promotion Board.
Chicago-referens (17:e uppl.)Singapore Tourist Promotion Board. Research Dept. Pleasure/vacation Visitors from the U.S.A. to Singapore with Special Reference to Visitors on Group Tours, 1972-1974. Singapore: Singapore Tourist Promotion Board, 1976.
MLA-referens (8:e uppl.)Singapore Tourist Promotion Board. Research Dept. Pleasure/vacation Visitors from the U.S.A. to Singapore with Special Reference to Visitors on Group Tours, 1972-1974. Singapore Tourist Promotion Board, 1976.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.