Não informado. (1990). New Directions for Adult and Continuing Education. Jessey Bass Publishers.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. New Directions for Adult and Continuing Education. San Francisco, Calif: Jessey Bass Publishers, 1990.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. New Directions for Adult and Continuing Education. Jessey Bass Publishers, 1990.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.