Tondorf, F. A. (1920). Anniversary tribute to George Martin Kober: In celebration of his seventieth birthday by his friends and associates, March 28, 1920.
Chicago-referens (17:e uppl.)Tondorf, Francis A. Anniversary Tribute to George Martin Kober: In Celebration of His Seventieth Birthday by His Friends and Associates, March 28, 1920. Washington, D.C, 1920.
MLA-referens (8:e uppl.)Tondorf, Francis A. Anniversary Tribute to George Martin Kober: In Celebration of His Seventieth Birthday by His Friends and Associates, March 28, 1920. 1920.
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