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 credit the inks to Jim Mooney
Writer credit by Martin O'Hearn.