Bell, K. L. (1979). Building English skills (Teacher's ed.). McDougal, Littell.
Lua i Stíl Chicago (17ú heag.)Bell, Kathleen L. Building English Skills. Teacher's ed. Evanston, Ill.: McDougal, Littell, 1979.
Lua MLA (8ú heag.)Bell, Kathleen L. Building English Skills. Teacher's ed. McDougal, Littell, 1979.
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