Hutton, Ronald. Blood and Mistletoe: The History of the Druids in Britain. New Haven, CT: Yale University Press, 2009.
———. The Stations of the Sun: A History of the Ritual Year in Britain. Oxford: Oxford University Press, 1996.
Mankey, Jason. Witch’s Wheel of the Year: Rituals for Circles, Solitaries & Covens. Woodbury, MN: Llewellyn Publications, 2019.