APA (7th ed.) Citation

World Tourism Organization. (1981). Domestic and international tourism's contribution to state revenue. The Organization.

Chicago Style (17th ed.) Citation

World Tourism Organization. Domestic and International Tourism's Contribution to State Revenue. Madrid: The Organization, 1981.

MLA (9th ed.) Citation

World Tourism Organization. Domestic and International Tourism's Contribution to State Revenue. The Organization, 1981.

Warning: These citations may not always be 100% accurate.