Wheeler, W. H. (1898). Wheeler's graded studies in English: First lessons in grammar and composition. W.H. Wheeler and Co..
Lua i Stíl Chicago (17ú heag.)Wheeler, William H. Wheeler's Graded Studies in English: First Lessons in Grammar and Composition. Chicago: W.H. Wheeler and Co., 1898.
Lua MLA (8ú heag.)Wheeler, William H. Wheeler's Graded Studies in English: First Lessons in Grammar and Composition. W.H. Wheeler and Co., 1898.
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