APA (7 ম সংস্করণ) উদ্ধৃতি

International Union of Official Travel Organisations. (1971). Methodology for annual and medium-term forecasts. International Union of Official Travel Organisations.

শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতি

International Union of Official Travel Organisations. Methodology for Annual and Medium-term Forecasts. Geneva: International Union of Official Travel Organisations, 1971.

M.L.A (9 ম সংস্করণ) উদ্ধৃতি

International Union of Official Travel Organisations. Methodology for Annual and Medium-term Forecasts. International Union of Official Travel Organisations, 1971.