Ferry, P. T. (1993). The Guiding Lights of the University of Wittenberg and the Emergence of Copernican Astronomy. Concordia theological quarterly, 57(1/4), pp. 265-291.

Ferry, Patrick T. "The Guiding Lights of the University of Wittenberg and the Emergence of Copernican Astronomy." Concordia Theological Quarterly 57, no. 1/4 (1993): 265-291.

Ferry, Patrick T. "The Guiding Lights of the University of Wittenberg and the Emergence of Copernican Astronomy." Concordia Theological Quarterly 57.1/4 (1993): 265-291.