Não informado. (1990). New Directions for Adult and Continuing Education. Jessey Bass Publishers.
Chicago-Zitierstil (17. Ausg.)Não informado. New Directions for Adult and Continuing Education. San Francisco, Calif: Jessey Bass Publishers, 1990.
MLA-Zitierstil (8. Ausg.)Não informado. New Directions for Adult and Continuing Education. Jessey Bass Publishers, 1990.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.