Gluck, Christoph Willibald. Orpheus, between 1860 and 1869? title page (edited by Charles Hallé)
Bielenberg, K. Karl Halle, 1819-1895, c1991 t.p. (Karl Halle) foreword (b. 4-11-1819; d. 10-25-1895)
Grove music online, viewed April 18, 2013 (Hallé, Sir Charles (born Carl Halle); born April 11, 1819, Hagen, Westphalia, died October 25, 1895, Manchester; English pianist and conductor of German birth; knighted in 1888)