Singapore Tourist Promotion Board. Research Dept. (1972). Report on the survey of hotel guests in Singapore, April 1970-March 1971.
Παραπομπή σε μορφή Chicago (17η εκδ.)Singapore Tourist Promotion Board. Research Dept. Report on the Survey of Hotel Guests in Singapore, April 1970-March 1971. [Singapore], 1972.
Παραπομπή σε μορφή MLA (8th εκδ.)Singapore Tourist Promotion Board. Research Dept. Report on the Survey of Hotel Guests in Singapore, April 1970-March 1971. 1972.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.