Não informado. (1968). IEEE international convention digest. Institute of Electrical and Electronics Engineers.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. IEEE International Convention Digest. New York: Institute of Electrical and Electronics Engineers, 1968.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. IEEE International Convention Digest. Institute of Electrical and Electronics Engineers, 1968.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.