Não informado. (1968). World meetings outside United States and Canada. Technical Meetings Information Service.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. World Meetings Outside United States and Canada. Newton Centre, Mass: Technical Meetings Information Service, 1968.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. World Meetings Outside United States and Canada. Technical Meetings Information Service, 1968.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.