Não informado. (1991). Adult Basic Education. Commission on Adult Basic Education.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Adult Basic Education. Atlanta, Ga: Commission on Adult Basic Education, 1991.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Adult Basic Education. Commission on Adult Basic Education, 1991.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.