| La rivolta dei sette | 1964 | Writer |
| Centomila dollari per Ringo | 1965 | Screenplay |
| Django tire le premier | 1966 | Screenplay |
| Superman le Diabolique | 1967 | Writer |
| La Gloire des canailles | 1967 | Writer |
| Le Tigre sort sans sa mère | 1967 | Screenplay |
| Femmine insaziabili | 1969 | Screenplay |
| Sur ordre du FĂĽhrer | 1969 | Screenplay |
| L'uomo dagli occhi di ghiaccio | 1971 | Writer |
| Dernier Appel | 1972 | Writer |
| Le TĂ©moin Ă abattre | 1973 | Writer |
| Le Conseiller | 1973 | Screenplay |
| L'Antéchrist | 1974 | Writer |
| 5 femmes pour l'assassin | 1974 | Screenplay |
| Roma violenta | 1975 | Screenplay |
| Bracelets de sang | 1975 | Screenplay |
| Roma drogata - La polizia non può intervenire | 1975 | Screenplay |
| Blazing Magnum | 1976 | Screenplay |
| Roma l'altra faccia della violenza | 1976 | Screenplay |
| Opération casseur | 1976 | Screenplay |
| Italia a mano armata | 1976 | Screenplay |
| Assaut sur la ville | 1977 | Screenplay |
| Da Corleone a Brooklyn | 1979 | Screenplay |
| Cul et chemise | 1979 | Screenplay |
| La Maison au fond du parc | 1980 | Writer |
| La Mort au large | 1981 | Screenplay |
| Pierino contro tutti | 1981 | Screenplay |
| Pierino colpisce ancora | 1982 | Screenplay |
| L'Éventreur de New-York | 1982 | Screenplay |
| I camionisti | 1982 | Screenplay |
| Les Prédateurs du futur | 1983 | Screenplay |
| Murderock | 1984 | Screenplay |
| Formule pour un meurtre | 1985 | Writer |
| Miami Golem | 1985 | Screenplay |
| Commando Cobra | 1986 | Writer |
| Un delitto poco comune | 1988 | Screenplay |
| Cobra Mission 2 | 1989 | Writer |
| Le Dernier match | 1990 | Writer |
| Panama Sugar | 1990 | Screenplay |
| Fuga da Kayenta | 1991 | Writer |
| Addio e Ritorno | 1996 | Writer |
