Não informado. (1971). IEEE Power Engineering Society. Institute of Electrical and Electronics Engineers.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. IEEE Power Engineering Society. New York: Institute of Electrical and Electronics Engineers, 1971.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. IEEE Power Engineering Society. Institute of Electrical and Electronics Engineers, 1971.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.