On-sale date from Comics Reader #128.
The cover is based on the splash page to "The Origin of Superman!" from The Amazing World of Superman, Metropolis Edition (DC, 1973 series) #[nn] by Carmine Infantino (layouts), Curt Swan (finished pencils), and Murphy Anderson (inks).
Oksner credits confirmed from The Amazing World of DC Comics (DC, 1974 series) #10. Pencils previously credited to Swan.