APA-ийн эшлэл(7 дахь хэвлэлт)
World Health Organization & ebrary, Inc. (2007). International travel and health: Situation as on 1 January 2007. World Health Organization.
Чикаго-гийн эшлэл (17 дахь хэвлэлт)
World Health Organization ба Inc ebrary. International Travel and Health: Situation as on 1 January 2007. Geneva: World Health Organization, 2007.
MLA -ийн эшлэл (9 дэх хэвлэлт)
World Health Organization ба Inc ebrary. International Travel and Health: Situation as on 1 January 2007. World Health Organization, 2007.
Анхааруулга: Эдгээр ишлэлүүд үргэлж 100% үнэн зөв биш байж магадгүй.