@book{28732, author = {World Health Organization.}, title = {International travel and health :}, publisher = {World Health Organization,}, year = {2004.}, address = {Geneva :}, note = {2004 edition published only ectronically on the ITH website: http://www.who.int/ith).; all earlier editions available in the Permanent Collection.}, url = {http://apps.who.int/iris/} }