Source : 1871 The Theory of Political Economy
William Stanley Jevons#Economics Quotes #Mathematical Quotes #Clear Quotes
Source : O. Henry (2015). “O. Henry's stories: Short Stories and Classic Literature”, p.218, 谷月社
Source : "Hadrian the Seventh" by Frederick Rolfe, Penguin Modern Classics edition, Harmondsworth, (p. 343), 1963.
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