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- [S497] Henrietta Novy, Severin Families 1776 - 2000, (N.p.: Henrietta Severin Novy, 2000.), Tab: John Zitko and Mary Severin. (Reliability: 2).
- [S54] "Find A Grave, Inc.," database, Find A Grave , (http://findagrave.com, 2007), 25 Jan 2024, Antonette Novotny, 45003817 (Reliability: 3).
- [S521] Illinois. Berwyn., Berwyn Life, "John J. Zitko," 13 Feb 1952, p. 5, col. 1; digital images, \i Newspapers.com by Ancestry\i0 newspapers.com : ). (Reliability: 3).
- [S522] Illinois. Chicago., Chicago Tribune, Zitko, p. 24, col. 8; digital images, \i Newspapers.com by Ancestry\i0 (newspapers.com : accessed 23 Jan 2024), Online Newspaper Archive. (Reliability: 3).
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