Lives of the Saints by Alban Butler.
Lives of the Saints by Sabine Baring-Gould.
The Liturgical Year by Dom Guéranger.
Our Birthday Bouquet Culled from the Shrines of the Saints and the Gardens of the Poets by Eleanor C. Donnelly.
Pictorial Half Hours with the Saints by Auguste François Lecanu.
All the other references to (presumably the same) Titus throughout the New Testament.
Art & Architecture
Medieval Religion Listserv – 2016 Dillon.
Lives and Legends of the Evangelists, Apostles, and Other Early Saints by Mrs. Arthur Bell.
The Saints in Art by Joseph Maria von Radowitz.
Emblems of Saints by Which They Are Distinguished in Works of Art by F. C. Husenbeth.