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I upvoted Greg's answer, because that is what I would do, if for some reason I could not ask the relevant authorities. Your first step should be to get a copy of the thesis formatting guide or manual of your institution. Most universities have one. Your second step, if this guide does not answer your question, should be to ask the examination authority of ...
I would not cite the quote differently than any other reference in your thesis. So which ever format your discipline uses (APA, MLA etc...) would be what you would use.
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