Não informado. (1969). WHO library acquisitions. World Health Organization.
Chicagoスタイル(17版)引用形式Não informado. WHO Library Acquisitions. Geneva, Suíça: World Health Organization, 1969.
MLA(8版)引用形式Não informado. WHO Library Acquisitions. World Health Organization, 1969.
警告: この引用は必ずしも正確ではありません.