Sullivan, J. W. N. (1952). Beethoven: His Spiritual Development (2. Aufl.). Mentor Books.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रSullivan, J. W. N. Beethoven: His Spiritual Development. 2. Aufl. New York: Mentor Books, 1952.
एमएलए (8वां संस्करण) प्रशस्ति पत्रSullivan, J. W. N. Beethoven: His Spiritual Development. 2. Aufl. Mentor Books, 1952.
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