Michael W. Stewart (2006-08-15). "Helm of Hades (Cap of Hades)". Greek Mythology: From The Iliad To The Fall Of The Last Tyrant. Diarsipkan dari versi asli tanggal 2007-09-28. Diakses tanggal 2007-05-05.
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Michael W. Stewart (2006-08-15). "Helm of Hades (Cap of Hades)". Greek Mythology: From The Iliad To The Fall Of The Last Tyrant. Diarsipkan dari versi asli tanggal 2007-09-28. Diakses tanggal 2007-05-05.