Snyder (1985) and, much more fully, Schiller (1972) cover these passim, see their indexes. Schiller's translator always translates the German term to "devotional images" etc. Snyder, James (1985). Northern Renaissance Art: painting, sculpture, the graphic arts from 1350 to 1575. New York: Harry N. Abrams. ISBN0-13-623596-4. OCLC10799841. Schiller, Gertrud (1972). Iconography of Christian Art. Vol. 2 (1st ed.). London: Lund Humphries. ISBN0-8212-0365-7. OCLC237920.