- (1965) Unsold pilot: Wrote the pilot for a sitcom to be called "Which Way to the Mecca, Jack" (based on his own 1960 novel) about a swinging Middle Eastern king who uses American aid to increase the size of his harem.
- (1971) Novel: "The Exorcist". NOTE: Filmed as L'Exorciste (1973).
- (1967) Novel: "Twinkle, Twinkle, Killer Kane". NOTE: Filmed as La Constellation des damnés (1980).
- (1965) Novel: "I, Billy Shakespeare!".
- (1963) Novel: "John Goldfarb, Please Come Home!". NOTE: Filmed as L'Encombrant Mr. John (1965).
- (1960) Novel: "Which Way to Mecca, Jack?".
- Novel: "Legion". NOTE: Filmed as L'Exorciste, la suite (1990).
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