Gerhild Scholz Williams, The Vision of Death: A Study of the Memento Mori Expressions in some Latin, German and French Didactic Texts of the 11th and 12th Centuries, Göppinger Arbeiten zur Germanistik, Göppingen, Kümmerle, 1976
CR (Du Bruck, Edelgard), in Oeuvres et critiques, 5, 1 (1980-1981), p. 156-158.