Não informado. (1989). Adult Learning. American Association for Adult & Continuing Education.
Chicago-Zitierstil (17. Ausg.)Não informado. Adult Learning. Washington: American Association for Adult & Continuing Education, 1989.
MLA-Zitierstil (8. Ausg.)Não informado. Adult Learning. American Association for Adult & Continuing Education, 1989.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.