Will Eisner's Comics and Sequential Art
Dorfman and Mattelart's How to Read Donald Duck
Martin Barker's Comics, Ideology, Power, and the Critics
Walter and Bissett's Comicbook Rebels
Witek's Comic Books as History: The Narrative Art of Jack Jackson, Art Spiegelman, and Harvey Pekar
Umberto Eco's "The Myth of Superman" (1960)
McCloud
Delany's own comic book criticism can be found in Silent Interviews and Shorter Views