The credits in this volume credit Murphy Anderson as the inker on this story but research indicates that it was most likely Joe Giella.
Some sources credit the inks for this story to Joe Giella.
Julius Schwartz's editorial records, provided by DC Comics, list Gil Kane as penciler and as inker. However art experts believe the inker is Murphy Anderson, a credit corroborated by Bob Bailey via e-mail on 5/16/2008.
Subsequent research reveals that Bob Rozakis credited Gil Kane as the sole artist of this cover in Green Lantern #100 (January 1978). The exclusive Kane credit was repeated in Showcase Presents Green Lantern vol. 2 (2007). Bob Bailey, on Aug. 21, 2011, gave an account of a conversation with Anderson, in which Anderson recalled working on this cover, but recalled that he was finishing or re-inking a cover inked first by Kane.