Lua APA (7ú heag.)

Não informado. (1950). Adult Education. American Association for Adult & Continuing Education.

Lua i Stíl Chicago (17ú heag.)

Não informado. Adult Education. Chapel Hill, NC: American Association for Adult & Continuing Education, 1950.

Lua MLA (8ú heag.)

Não informado. Adult Education. American Association for Adult & Continuing Education, 1950.

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