Barry Gibbons. (2007). Speak Easy: 52 brilliant ideas for giving stunning speeches. Infinite Ideas.
シカゴスタイル引用形Barry Gibbons. Speak Easy: 52 Brilliant Ideas for Giving Stunning Speeches. Infinite Ideas, 2007.
MLA引用形式Barry Gibbons. Speak Easy: 52 Brilliant Ideas for Giving Stunning Speeches. Infinite Ideas, 2007.
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