World Tourism Organization. (2002). Voluntary initiatives for sustainable tourism: Worldwide inventory and comparative analysis of 104 eco-labels, awards and self-commitments. World Tourism Organization.
Chicago Style (17th ed.) CitationWorld Tourism Organization. Voluntary Initiatives for Sustainable Tourism: Worldwide Inventory and Comparative Analysis of 104 Eco-labels, Awards and Self-commitments. Madrid: World Tourism Organization, 2002.
MLA (9th ed.) CitationWorld Tourism Organization. Voluntary Initiatives for Sustainable Tourism: Worldwide Inventory and Comparative Analysis of 104 Eco-labels, Awards and Self-commitments. World Tourism Organization, 2002.
Warning: These citations may not always be 100% accurate.