Não informado. (1980). New Directions for Teaching and Learning. Jessey Bass Publishers.
Lua i Stíl Chicago (17ú heag.)Não informado. New Directions for Teaching and Learning. San Francisco, Calif: Jessey Bass Publishers, 1980.
Lua MLA (8ú heag.)Não informado. New Directions for Teaching and Learning. Jessey Bass Publishers, 1980.
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