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
Paramount Pictures ; story by John Herman Shaner & Al Ramrus ; screenplay by John Herman Shaner & Al Ramrus and Charles Shyer & Alan Mandel ; produced by Harry Gittes and Harold Schneider ; directed by Jack Nicholson