4根据世界贸易组织(World trade developments in 2007》、《World trade developments in 2008》计算获得.
5根据国家旅游局《中国旅游统计年鉴2008》计算获得.
6John C Crotts , Abdul. Antecedents of Suppliers Commit- merit to Wholesale Buyers in the International Travel Trade [J]. Tourism Management, 1998, 19 (2): 127-134.