Não informado. (1952). Adult leadership. Adult Education Association of the United States of America.
Chicago-referens (17:e uppl.)Não informado. Adult Leadership. Washington: Adult Education Association of the United States of America, 1952.
MLA-referens (8:e uppl.)Não informado. Adult Leadership. Adult Education Association of the United States of America, 1952.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.