Hill, O. C. (1892). The Columbian fourth reader. George W. Crane & Co..
Lua i Stíl Chicago (17ú heag.)Hill, O. C. The Columbian Fourth Reader. Topeka, Kansas: George W. Crane & Co., 1892.
Lua MLA (8ú heag.)Hill, O. C. The Columbian Fourth Reader. George W. Crane & Co., 1892.
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