Não informado. (1966). Programmed learning and educational technology. Association for Programmed Learning.
Chicago-Zitierstil (17. Ausg.)Não informado. Programmed Learning and Educational Technology. London: Association for Programmed Learning, 1966.
MLA-Zitierstil (8. Ausg.)Não informado. Programmed Learning and Educational Technology. Association for Programmed Learning, 1966.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.