Não informado. (1950). Adult Education. American Association for Adult & Continuing Education.
Chicago-referens (17:e uppl.)Não informado. Adult Education. Chapel Hill, NC: American Association for Adult & Continuing Education, 1950.
MLA-referens (8:e uppl.)Não informado. Adult Education. American Association for Adult & Continuing Education, 1950.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.