Calkins, Robert G. (1983): . Ithaca, New York: Cornell University Press. De Hamel, Christopher (1986): . Boston: David R. Godine. Meehan, Bernard (1996): , Town House, Dublin, ISBN 1570980535 Nordenfalk, Carl (1977): . Chatto & Windus, London (New York: George Braziller). Wilson, David M. (1984): , Thames and Hudson (amerikansk utg. ved Overlook Press). Walther, Ingo F. & Wolf, Norbert (2005): . Köln, Taschen.