Singapore Tourist Promotion Board. Research Dept. (1972). Report on the survey of hotel guests in Singapore, April 1970-March 1971.
Chicago-referens (17:e uppl.)Singapore Tourist Promotion Board. Research Dept. Report on the Survey of Hotel Guests in Singapore, April 1970-March 1971. [Singapore], 1972.
MLA-referens (8:e uppl.)Singapore Tourist Promotion Board. Research Dept. Report on the Survey of Hotel Guests in Singapore, April 1970-March 1971. 1972.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.