Sources

John McCormack - His Own Story, Pierre Key, Small, Maynard Co. 1918.
John McCormack, L.A.G. Strong, Peter Neville Ltd 1949.
I Hear You Calling Me, Lily McCormack, W.H. Allen 1950.
John McCormack, Raymond Foxall, Robert Hale Ltd 1963.
The Great Irish Tenor, Gordon Ledbetter, Duckworth & Co. 1977.
Capuchin Annual 1946-47, Various Contributors, Capuchin Fathers 1946.
The Amazing Oscar Hammerstein, Vincent Sheehan, Weidenfeld & Nicolson 1956.
McCormack Commentaries I, II, III, Theo Mortimer, Prima Voce - Nimbus Records 1991, 1993, 1995.
John Count McCormack, Theo Mortimer, Dublin Historical Record Vol. XLVIII No. 2, 1995.

The Times
The Irish Times
The Daily Telegraph
The Melbourne Herald
Musical Opinion & Review
The New York Evening Post