in The Official Marvel Index to the X-Men (Marvel, 1987 series) #2 (July 1987)
in Marvel Masterworks: The X-Men (Marvel, 2003 series) #4 ([October] 2004)
in The X-Men Omnibus (Marvel, 2009 series) #2 ([April] 2011)Heck pencils, Tuska inks per Nick Caputo. Rich Donnelly credited Heck with inks and Tuska on pencils.
in Fantastic and Terrific (IPC, 1968 series) #80 (24 August 1968) [artwork reworked as cover], #80 (24 August 1968) [part 1], #81 (31 August 1968) [part 2]
in The X-Men (Marvel, 1963 series) #89 (August 1974)
in Marvel Special (Marvel Italia, 1994 series) #15 (Dicembre 1998)
in Marvel Masterworks: The X-Men (Marvel, 2003 series) #4 ([October] 2004)
in The X-Men Omnibus (Marvel, 2009 series) #2 ([April] 2011)Changeling is disguised as Professor X.
in Amazing Adventures (Marvel, 1979 series) #4 (March 1980)
in The Marvel Saga (Marvel, 1985 series) #4 (March 1986)
in Marvel Special (Marvel Italia, 1994 series) #4 (Luglio 1995)
in Marvel Masterworks: The X-Men (Marvel, 2003 series) #4 ([October] 2004)
in The X-Men Omnibus (Marvel, 2009 series) #2 ([April] 2011)
in The X-Men Omnibus (Marvel, 2009 series) #2 ([April] 2011)