Melissa J. Wilde: Vatican II: A Sociological Analysis of Religious Change, S. 134, 136, Princeton University Press, 2018, ISBN 0-6911-8858-0 (Online-Version)
Martin Bräuer: Handbuch der Kardinäle: 1846-2012, S. 647, Walter de Gruyter GmbH & Co KG, 2014, ISBN 3-1102-6947-3 (Online-Version)