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
a Paramount release ; the John Ford production ; screenplay by James Warner Bellah and Willis Goldbeck ; produced by Willis Goldbeck ; directed by John Ford
a Rafran-San Marco production ; a Sergio Leone film ; screenplay by Sergio Donati, Sergio Leone ; produced by Fulvio Morsella ; directed by Sergio Leone