Jerry Serpe was named as the uncredited colorist of a Sgt. Rock Annual by Dan Spiegle in an Internet video (Evanier 2020, 1:14:25) (Spiegle also drew Sgt. Rock Annual #2; its colorist was credited).
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Evanier, Mark. “Conversation with Kurt Busiek” (video). Posted August 18, 2020. Accessed August 20, 2020. https://www.youtube.com/watch?v=bFscrKDVxn0.