Paramount Pictures Corporation, Rafran Cinematografica, San Marco Productions ; produced by Fulvio Morsella ; screenplay by Sergio Donati and Sergio Leone ; from a story by Dario Argento, Bernardo Bertolucci and Sergio Leone ; directed by Sergio Leone
National General Pictures ; written by James Lee Barrett ; produced and directed by Gene Kelly ; Firecreek / Warner Bros. Pictures ; produced by Philip Leacock ; directed by Vincent McEveety ; written by Calvin Clements
a Rafran-San Marco production ; a Sergio Leone film ; screenplay by Sergio Donati, Sergio Leone ; produced by Fulvio Morsella ; directed by Sergio Leone
a Rafran-San Marco production ; a Sergio Leone film ; directed by Sergio Leone ; produced by Fulvio Morsella ; screenplay by Sergio Donati, Sergio Leone