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A UK style guide's advice The Oxford Guide to Style (2002) addresses this problem as follows: Occasionally it may be necessary to indicate italics in text that is already italicized, especially in titles or foreign text. In this instance the opposite font—roman type—is chosen: [Relevant example:] La Physiognomie arabe et le Kitâb al-Firâsa de Fakhr al-Dîn ...


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