History of character is unknown.
- This version of Bart Regan, including all history and corresponding appearances, was initially erased from existence following the collapse of the original Multiverse in the 1985-86 Crisis on Infinite Earths limited series. However the ending of Convergence retroactively prevented that collapse, saving all the alternate realities, though in an "evolved" form. Even though versions of the character may have since appeared, this information does not apply to those versions.
- Bart Regan's first published appearance was in Comics Magazine #2 June 1936, published by Centaur Publications. The feature did not return in issue #3 of that title, and its second appearance was in Detective Comics #1, published by Detective Comics, Inc.
- 84 Appearances of Bartholomew Regan (Earth-Two)
- 2 Images featuring Bartholomew Regan (Earth-Two)
- 1 Quotations by or about Bartholomew Regan (Earth-Two)
- Character Gallery: Bartholomew Regan (Earth-Two)
- Bart Regan at dccomics.com
- Bart Regan at Wikipedia.org
- Bart Regan biography page at the Unofficial Guide to the DC Universe
- Classic Comics Books - Bart Regan page