| Zorro il ribelle | 1966 | Writer |
| Un milione di dollari per 7 assassini | 1966 | Screenplay |
| Assalto al tesoro di stato | 1967 | Screenplay |
| Samoa, fille sauvage | 1968 | Writer |
| Il figlio di Aquila Nera | 1968 | Screenplay |
| Le calde notti di Poppea | 1969 | Writer |
| Un corpo caldo per l'inferno | 1969 | Screenplay |
| L'Assassin FantĂ´me | 1969 | Writer |
| Tarzana, sexe sauvage | 1969 | Writer |
| Formula 1 - Nell'Inferno del Grand Prix | 1970 | Writer |
| Un Papillon aux ailes ensanglantées | 1971 | Writer |
| La Longue Nuit de l'exorcisme | 1972 | Screenplay |
| La calandria | 1972 | Screenplay |
| Le TĂ©moin Ă abattre | 1973 | Writer |
| La Belle et le Puceau | 1974 | Screenplay |
| L'Antéchrist | 1974 | Writer |
| 5 femmes pour l'assassin | 1974 | Screenplay |
| Les 2 Missionnaires | 1974 | Screenplay |
| Corruzione al palazzo di giustizia | 1975 | Screenplay |
| Blazing Magnum | 1976 | Screenplay |
| Culastrisce nobile veneziano | 1976 | Writer |
| Roma l'altra faccia della violenza | 1976 | Screenplay |
| Italia a mano armata | 1976 | Screenplay |
| La svastica nel ventre | 1977 | Screenplay |
| Le Dernier Monde Cannibale | 1977 | Screenplay |
| Assaut sur la ville | 1977 | Screenplay |
| Black Emanuelle autour du monde | 1977 | Writer |
| De l'enfer Ă la victoire | 1979 | Screenplay |
| Cannibal Holocaust | 1980 | Screenplay |
| La Maison au fond du parc | 1980 | Writer |
| Pierino contro tutti | 1981 | Screenplay |
| Pierino colpisce ancora | 1982 | Screenplay |
| L'Éventreur de New-York | 1982 | Screenplay |
| I camionisti | 1982 | Screenplay |
| Murderock | 1984 | Screenplay |
| Le monstre de l'océan rouge | 1984 | Screenplay |
| Tex et le seigneur des abysses | 1985 | Screenplay |
| Miami Golem | 1985 | Screenplay |
| Commando Cobra | 1986 | Writer |
| Desiderando Giulia | 1986 | Screenplay |
| Sensi | 1986 | Writer |
| Delirium | 1987 | Screenplay |
| Un delitto poco comune | 1988 | Screenplay |
| Cobra Mission 2 | 1989 | Writer |
| Le Dernier match | 1990 | Writer |
| Scandalo segreto | 1990 | Writer |
| Addio e Ritorno | 1996 | Writer |
| Laura non c'è | 1998 | Screenplay |
