Não informado. (1952). Adult leadership. Adult Education Association of the United States of America.
Chicago-Zitierstil (17. Ausg.)Não informado. Adult Leadership. Washington: Adult Education Association of the United States of America, 1952.
MLA-Zitierstil (8. Ausg.)Não informado. Adult Leadership. Adult Education Association of the United States of America, 1952.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.