Não informado. Progress in Standardization. World Health Organization.
Chicago-Zitierstil (17. Ausg.)Não informado. Progress in Standardization. Geneva, Suíça: World Health Organization.
MLA-Zitierstil (8. Ausg.)Não informado. Progress in Standardization. World Health Organization.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.