Betts, E. A., Esterer, L. A., & Betts, E. A. (1947). Directed spelling activities. American Book Co..
Style de citation Chicago (17e éd.)Betts, Emmett A., Louise A. Esterer, et Emmett Albert Betts. Directed Spelling Activities. [New York ; Cincinnati]: American Book Co., 1947.
Style de citation MLA (8e éd.)Betts, Emmett A., et al. Directed Spelling Activities. American Book Co., 1947.
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