Data Publicação: 2007 Col.autor: wttcEasyJetRyanairManchester Airports GroupCornell UniversityWorldhotelsGordon Campbell GrayRelais & ChateauxB.J.CunninghamDaniela WagnerBreaking Travel News
Autor: Dev, Ckekitan S.; Brown, James R.; Zhou, Kevin Zheng Data Publicação: 2007 Col.autor: Cornell University