Παραπομπή APA

World Tourism Organization., & UNWTO. (2013). Yearbook of Tourism Statistics: Data 2007-2011, 2013 Edition. Madrid: World Tourism Organization.

Παραπομπή Chicago Style

World Tourism Organization., and UNWTO. Yearbook of Tourism Statistics: Data 2007-2011, 2013 Edition. Madrid: World Tourism Organization, 2013.

Παραπομπή MLA

World Tourism Organization., and UNWTO. Yearbook of Tourism Statistics: Data 2007-2011, 2013 Edition. Madrid: World Tourism Organization, 2013.

Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.