The Oscar-nominated screenwriters and book author Walter Kirn claimed the the 22nd Annual USC Libraries Scripter Award for the hit film.
The Scripters recognise the author and writers of a produced literary work-to-film adaptation.
Reitman and Turner have already won a string of awards and are favourites to land gold at the Oscars next month (Mar10).
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Also honoured at the Scripters was Eric Roth, the writer behind adaptations like Forrest Gump.
He was presented with a Scripter Literary Achievement Award.
The honours were handed out at a gala ceremony in Los Angeles on Saturday (07Feb10).
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