Greene, H. A., & Petty, W. T. (1963). Developing language skills in the elementary schools (2d ed.). Allyn and Bacon.
Lua i Stíl Chicago (17ú heag.)Greene, Harry Andrew, agus Walter Thomas Petty. Developing Language Skills in the Elementary Schools. 2d ed. Boston: Allyn and Bacon, 1963.
Lua MLA (9ú heag.)Greene, Harry Andrew, agus Walter Thomas Petty. Developing Language Skills in the Elementary Schools. 2d ed. Allyn and Bacon, 1963.
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