Não informado. (1952). Adult leadership. Adult Education Association of the United States of America.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Adult Leadership. Washington: Adult Education Association of the United States of America, 1952.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Adult Leadership. Adult Education Association of the United States of America, 1952.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.