Não informado. (1971). World meetings. World Meetings Information Center.
Style de citation Chicago (17e éd.)Não informado. World Meetings. Chestnut Hill, Mass: World Meetings Information Center, 1971.
Style de citation MLA (8e éd.)Não informado. World Meetings. World Meetings Information Center, 1971.
Attention : ces citations peuvent ne pas être correctes à 100%.