Não informado. (1968). World meetings outside United States and Canada. Technical Meetings Information Service.
Chicago-referens (17:e uppl.)Não informado. World Meetings Outside United States and Canada. Newton Centre, Mass: Technical Meetings Information Service, 1968.
MLA-referens (8:e uppl.)Não informado. World Meetings Outside United States and Canada. Technical Meetings Information Service, 1968.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.