Dyfyniad APA

World Health Organization. (2000). International travel and health: Vaccination requirements and health advice. World Health Organization.

Dyfyniad Arddull Chicago

World Health Organization. International Travel and Health: Vaccination Requirements and Health Advice. Geneva: World Health Organization, 2000.

Dyfyniad MLA

World Health Organization. International Travel and Health: Vaccination Requirements and Health Advice. World Health Organization, 2000.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.