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/).
Inside front cover.
Letters credit from Todd Klein via his Klein Letters blog (19 September 2016, http://kleinletters.com/Blog/ira-schnapp-in-worlds-finest-comics-part-2/). Schnapp did not do the word balloons. The word balloons were probably done by the artist.
Writer credit per Craig Delich.
Possible script credits per Craig Delich. Inks credit also per Delich; we formerly credited Charles Paris.