The illustration of the heavenly Ladder of John Climacus

by Martin, John Rupert
Published 1954

Barockthemen : eine Auswahl von Verzeichnissen zur Ikonographie des 17. und 18. Jahrhunderts

by Pigler, Andor
Published 1956

SS. Quattuor Coronati : bibliography and iconography; an essay

by Dionigi, Renzo
Published 1998