writing

1976
La Promesa
-
Writer
1975
School of Death
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Story
1970
When Heroes Die
-
Writer
1969
A Bullet for Rommel
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Story
1969
A Bullet for Rommel
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Screenplay
1969
Hell Commandos
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Writer
1969
Twenty Thousand Dollars for Seven
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Screenplay
1968
Seven Into Hell
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Writer
1968
¡Cuidado con las señoras!
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Writer
1967
The Vengeance of Pancho Villa
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Writer
1966
A Few Dollars for Django
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Story
1966
A Few Dollars for Django
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Screenplay
1966
Two Guns for Two Twins
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Story
1965
The Relentless Four
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Screenplay
1964
Hour of Death
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Screenplay
1964
Black Angel of the Mississippi
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Writer
1963
Los conquistadores del Pacífico
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Story
1963
Los conquistadores del Pacífico
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Screenplay
1961
Rosa de Lima
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Screenplay
1958
The Tenant
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Screenplay