Não informado. (1950). Adult Education. American Association for Adult & Continuing Education.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Adult Education. Chapel Hill, NC: American Association for Adult & Continuing Education, 1950.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Adult Education. American Association for Adult & Continuing Education, 1950.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.