Um. . .: Slips, Stumbles, and Verbal Blunders, and What They Mean
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Carry On, My Wayward Tongue: Michael Erard on 'Um : Slips

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Um: Slips, Stumbles and Verbal Blunders and What They Mean

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Stutters, Stammers, and Vocal Fillers (2018)
Um. . . Penguin Random House Higher Education
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