Dictionary of Celtic Myth and Legend (p. 42). London: Thames and Hudson. ISBN 0-500-01516-3. MacCulloch, J. A. (1911). The religion of the ancient Celts. New
Wagenvoort), "Characteristic Traits of Ancient Roman Religion," in Pietas: Selected Studies in Roman Religion (Brill, 1980), p. 241, ascribing the view