Coba jelasin Sumber dari Constance dari Arles dong

Jessee, W. Scott. A missing Capetian princess: Advisa, daughter of King Robert II of France (Medieval Prosopography), 1990

Nolan, Kathleen D. Capetian Women, 2003.

Moore, R.I. The Birth of Popular Heresy, 1975.

Ancestral Roots of Certain American Colonists Who Came to America Before 1700 by Frederick Lewis Weis, Lines: 53-21, 101-21, 107-20, 108-21, 128-21, 141-21, 141A-21, 185-2.

Lambert, Malcolm. Medieval Heresy: Popular Movements from the Gregorian Reform to the Reformation, 1991, 9 - 17.