Não informado. (1990). New Directions for Adult and Continuing Education. Jessey Bass Publishers.
Lua i Stíl Chicago (17ú heag.)Não informado. New Directions for Adult and Continuing Education. San Francisco, Calif: Jessey Bass Publishers, 1990.
Lua MLA (8ú heag.)Não informado. New Directions for Adult and Continuing Education. Jessey Bass Publishers, 1990.
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