Não informado. (1973). Bulletin of the Pan American Health Organization. Pan American Health Organization.
Chicago-referens (17:e uppl.)Não informado. Bulletin of the Pan American Health Organization. Washington: Pan American Health Organization, 1973.
MLA-referens (8:e uppl.)Não informado. Bulletin of the Pan American Health Organization. Pan American Health Organization, 1973.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.