Targets (1968) - Welles co-wrote script

[Harvey Chartrand]

I saw 'Targets' at a drive-in in '68 and of course that was the ideal venue in which to view this shattering crime thriller (which ends with a psycho shooting people from behind a drive-in screen). Does anyone know how much of the screenplay was written by Welles, who took no credit? Samuel Fuller also had an uncredited hand in writing the script, credited to Polly Platt and Peter Bogdanovich.