Não informado. (1967). WORLD MEETINGS, UNITED STATES AND CANADA. Technical Meetings Information Service.
Chicago-referens (17:e uppl.)Não informado. WORLD MEETINGS, UNITED STATES AND CANADA. New York: Technical Meetings Information Service, 1967.
MLA-referens (8:e uppl.)Não informado. WORLD MEETINGS, UNITED STATES AND CANADA. Technical Meetings Information Service, 1967.
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