The words/phrases that bear an intertextual reference in the given sentence are: Jamie Oliver and a la France.
Jamie Oliver is a reference to Common Knowledge while a la France is a reference to popular culture.
Intertextual reference means the meaning of a text that is influenced by other texts.
In the above example, we find that the allusion to Jamie Oliver calls to mind a popular British chef while the French phrase is a reference to popular culture. The phrase means, "the French type."
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