Citação norma APA
(1981). World health statistics annual 1981: Vital statistics and causes of death. World Health Organization.
Citação norma Chicago
World Health Statistics Annual 1981: Vital Statistics and Causes of Death. Genéve: World Health Organization, 1981.
Citação norma MLA
World Health Statistics Annual 1981: Vital Statistics and Causes of Death. World Health Organization, 1981.
Nota: a formatação da citação pode não corresponder 100% ao definido pela respectiva norma.