Letterer credit by Martin O'Hearn and Joe Desris.
Script credit by Martin O'Hearn. Inker credit verified by Paris.
On the page between page 8 and page 9 of "The Mystery of Madcap Island."
Letters of comment from Ray Cardinal, Louis Gilio, Jimmy Gray, Gary Joel Harris, Jim Gartland, Steve Joseph Sullivan and Peter Pappas.
Script credit by Martin O'Hearn. Inker credit verified by Paris.
A list by Lionel English also gives the penciller and inker as "Morris Waldinger" in one of the issues this PSA appears in.
Other credits from a list by Lionel English via Donald Dale Milne.