On-sale date from promo in Action Comics # 271
in Showcase Presents Superman (DC, 2005 series) #2 (2006) [black and white]
in Limited Collectors' Edition (DC, 1972 series) #C-31 (October-November 1974)
in Showcase Presents Superman (DC, 2005 series) #2 (2006) [black and white]published in cooperation with the National Social Welfare Assembly
in Superman (DC, 1939 series) #197 (June-July 1967)
in 80 Page Giant (DC, 1964 series) #G36 (June-July 1967)
in Supermann (Se-Bladene, 1966 series) #3/1968 ([mars] 1968)
in Supermann (Williams Forlag, 1969 series) #17/1969 ([desember] 1969) [2. translation]
in Superman from the Thirties to the Seventies (Crown Publishers, 1971 series) #[nn] (1971)
in Showcase Presents Superman (DC, 2005 series) #2 (2006) [black and white]Time-travel story
Letters submitted by William Cassity; Carman Tisdel; Anne Zeek; Don Farb; Terry Fielden; Linda Rocawich
Mort incorrectly explains that Mxyzptlk is pronounced "Mix-Yez-Pitel-Ick".
This misinformation is corrected in a later letters page where it is stated that Mxyzptlk only has three syllables.
in World's Finest Comics (DC, 1941 series) #142 (June 1964)
in Showcase Presents Superman (DC, 2005 series) #2 (2006) [black and white]
in Gigant (Centerförlaget, 1963 series) #1/1965