Chesterton, G. K. (1906). Twelve types (4th impression.). A. L. Humphreys.
Lua i Stíl Chicago (17ú heag.)Chesterton, G. K. Twelve Types. 4th impression. London: A. L. Humphreys, 1906.
Lua MLA (8ú heag.)Chesterton, G. K. Twelve Types. 4th impression. A. L. Humphreys, 1906.
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