Não informado. (1966). Programmed learning and educational technology. Association for Programmed Learning.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Programmed Learning and Educational Technology. London: Association for Programmed Learning, 1966.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Programmed Learning and Educational Technology. Association for Programmed Learning, 1966.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.