Betts, E. A., & O'Donnell, M. (1938). Guidebook for teachers on initial stages of reading readiness. Row, Peterson & Company.
Lua i Stíl Chicago (17ú heag.)Betts, Emmett A., agus Mabel O'Donnell. Guidebook for Teachers on Initial Stages of Reading Readiness. Evanston, Illinois ; New York City ; San Francisco: Row, Peterson & Company, 1938.
Lua MLA (8ú heag.)Betts, Emmett A., agus Mabel O'Donnell. Guidebook for Teachers on Initial Stages of Reading Readiness. Row, Peterson & Company, 1938.
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