Παραπομπή APA

World Health Organization. (2003). State of the world's vaccines and immunization. World Health Organisation.

Παραπομπή Chicago Style

World Health Organization. State of the World's Vaccines and Immunization. Geneva: World Health Organisation, 2003.

Παραπομπή MLA

World Health Organization. State of the World's Vaccines and Immunization. World Health Organisation, 2003.