Não informado. (1964). Programmed learning. Association for Programmed Learning.
Chicago-Zitierstil (17. Ausg.)Não informado. Programmed Learning. London: Association for Programmed Learning, 1964.
MLA-Zitierstil (8. Ausg.)Não informado. Programmed Learning. Association for Programmed Learning, 1964.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.