1 2 3 Captain Atom Annual #2 (1988) ↑ JLA Incarnations #6 (December 2, 2001) ↑ Beatty, Scott (2008), "Extreme Justice", in Dougall, Alastair, The DC Comics Encyclopedia, New York: Dorling Kindersley, p. 117, ISBN 0-7566-4119-5, OCLC 213309017 ↑ Checkmate (vol.