Herm, G. (1976). The celts: The people who came out of the darkness. Ms. Rowan.
Chicago-referens (17:e uppl.)Herm, Gerhard. The Celts: The People Who Came Out of the Darkness. New York: Ms. Rowan, 1976.
MLA-referens (9:e uppl.)Herm, Gerhard. The Celts: The People Who Came Out of the Darkness. Ms. Rowan, 1976.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.