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 Rafran-San Marco production ; a Sergio Leone film ; screenplay by Sergio Donati, Sergio Leone ; produced by Fulvio Morsella ; directed by Sergio Leone