Não informado. (1964). Programmed learning. Association for Programmed Learning.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Programmed Learning. London: Association for Programmed Learning, 1964.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Programmed Learning. Association for Programmed Learning, 1964.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.