; "The Pictorial arts of the West, 800-1200", 1993, Yale UP, ISBN 0-300-06493-4*Gaehde, Joachim E. (1989).
; "The Pictorial arts of the West, 800-1200", 1993, Yale UP, ISBN 0-300-06493-4*Gaehde, Joachim E. (1989).