Pfeiffer, G., & Dürer, A. (1972). Albrecht Dürer's "Four Apostles": A memorial picture from the Reformation era. The social history of the Reformation, pp. 271-296.

Pfeiffer, Gerhard, und Albrecht Dürer. "Albrecht Dürer's "Four Apostles": A Memorial Picture From the Reformation Era." The Social History of the Reformation 1972: 271-296.

Pfeiffer, Gerhard, und Albrecht Dürer. "Albrecht Dürer's "Four Apostles": A Memorial Picture From the Reformation Era." The Social History of the Reformation 1972: 271-296.