World Health Organization & ebrary, Inc. (2008). International travel and health: Situation as on 1 January 2008. World Health Organization.
Chicagoスタイル(17版)引用形式World Health Organization , Inc ebrary. International Travel and Health: Situation as on 1 January 2008. Geneva: World Health Organization, 2008.
MLA(9版)引用形式World Health Organization , Inc ebrary. International Travel and Health: Situation as on 1 January 2008. World Health Organization, 2008.
警告: この引用は必ずしも正確ではありません.