Ante-Nicene Fathers: Introductory Note to the Epistles of Ignatius  
   American revision by A. Cleveland Coxe, of the original introductory notice, gives information on the genuine and spurious epistles, the shorter and longer Greek versions, and the discovery in 1842 of Syriac versions of three of the genuine epistles.
   http://www.ccel.org/fathers2/ANF-01/anf01-15.htm

Ante-Nicene Fathers: Introductory Note to the Syriac Version of the Ignatian Epistles  
   Information on the Syriac version of three of St. Ignatius of Antioch's letters.
   http://www.ccel.org/fathers2/ANF-01/anf01-23.htm

The Ignatian Epistles Entirely Spurious  
   E-text of 1886 "Reply to The Right Rev. Dr. Lightfoot" by W. D. Killen, Irish presbyterian, proposing that the epistles were third-century forgeries promoting the monoepiscopate system.
   http://gutenberg.org/etext/8908

Dictionary of Christian Biography and Literature: Ignatius  
   Biographical notes and extensive introduction to the history of criticism of the letters.
   http://ccel.org/ccel/wace/biodict.Ignatius_1.html

Ignatius' Epistles: Are They Forgeries?  
   Unpublished study proposing multiple forgers with independent tendancies and motives.
   http://www.geocities.com/b_d_muller/ignatius.html