Betts, E. A., Esterer, L. A., & Betts, E. A. (1947). Directed spelling activities. American Book Co..
Lua i Stíl Chicago (17ú heag.)Betts, Emmett A., Louise A. Esterer, agus Emmett Albert Betts. Directed Spelling Activities. [New York ; Cincinnati]: American Book Co., 1947.
Lua MLA (8ú heag.)Betts, Emmett A., et al. Directed Spelling Activities. American Book Co., 1947.
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