Παραπομπή σε μορφή APA (7η εκδ.)

World Tourism Organization. (1999). Sustainable development of tourism: An annotated bibliography. November 1999. World Tourism Organization.

Παραπομπή σε μορφή Chicago (17η εκδ.)

World Tourism Organization. Sustainable Development of Tourism: An Annotated Bibliography. November 1999. Madrid: World Tourism Organization, 1999.

Παραπομπή σε μορφή MLA (9th εκδ.)

World Tourism Organization. Sustainable Development of Tourism: An Annotated Bibliography. November 1999. World Tourism Organization, 1999.