Bock, E. C. (1977). Wilhelm von Ketteler, Bishop of Mainz: His life, times and ideas. University Press of America.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रBock, Edward C. Wilhelm Von Ketteler, Bishop of Mainz: His Life, Times and Ideas. Washington, D.C.: University Press of America, 1977.
एमएलए (8वां संस्करण) प्रशस्ति पत्रBock, Edward C. Wilhelm Von Ketteler, Bishop of Mainz: His Life, Times and Ideas. University Press of America, 1977.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.