Não informado. (1968). World Health Statistics Report. World Health Organization.
Chicagoスタイル(17版)引用形式Não informado. World Health Statistics Report. Geneva, Suíça: World Health Organization, 1968.
MLA(8版)引用形式Não informado. World Health Statistics Report. World Health Organization, 1968.
警告: この引用は必ずしも正確ではありません.