Não informado. (1969). WHO library acquisitions. World Health Organization.
Style de citation Chicago (17e éd.)Não informado. WHO Library Acquisitions. Geneva, Suíça: World Health Organization, 1969.
Style de citation MLA (8e éd.)Não informado. WHO Library Acquisitions. World Health Organization, 1969.
Attention : ces citations peuvent ne pas être correctes à 100%.