Apostolic Fathers.; Ignatius, Saint, Bishop of Antioch, died ca. 110.; Polycarp, Saint, Bishop of Smyrna.; Clement, I, Pope.; Jacobson, William(1863, v.1)
Forbes, Archibald.
By Archibald Forbes. Illustrated by portraits in the possession of the author, and by four special drawings by Sidney P. Hall.(New York, Charles Scribner's Sons, 1895)
Michaelsen, Wilhelm (author of Oligochaeta); Bormans, A. de (Auguste) and Krauss, Hermann August (joint authors of Forficulidae und Hemimeridae)(Berlin, R. Friedländer und Sohn, 1900)