On-sale date from copyright registration.
Bob Klein, Gene Reed, Bob Hughes, and Mike Tiefenbacher credit the art to Dick Dillin and Sheldon Moldoff; Craig Delich and Pat Lang credit Jim Mooney and Moldoff. Letters credit from Todd Klein via his Klein Letters blog (18 September 2016, http://kleinletters.com/Blog/ira-schnapp-in-worlds-finest-comics-part-1/).
Bob Klein and Gene Reed previously credited the inks to Jim Mooney.
Writer credit by Martin O'Hearn.