Wagner, C. (1912). An experimental study of grouping by similarity as a factor in the teaching of spelling. Univ. of Pennsylvania.
Cita Chicago Style (17a ed.)Wagner, Charles. An Experimental Study of Grouping by Similarity as a Factor in the Teaching of Spelling. Univ. of Pennsylvania, 1912.
Cita MLA (9a ed.)Wagner, Charles. An Experimental Study of Grouping by Similarity as a Factor in the Teaching of Spelling. Univ. of Pennsylvania, 1912.
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