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1
Wyznania mówcy : spraw, by ludzie cię słuchali /
Published 2012Subjects: “…Public speaking.…”
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2
Confessions of a public speaker /
Published 2010Subjects: “…Public speaking.…”
Full Text (via Internet Archive)
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3
Confessions of a public speaker /
Published 2009Subjects: “…Public speaking.…”
Full Text (via O'Reilly/Safari)
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4
Bekenntnisse eines Redners : oder die Kunst, gehört zu werden /
Published 2010Subjects: “…Public speaking.…”
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5