Não informado. (1966). Programmed learning and educational technology. Association for Programmed Learning.
Chicago-referens (17:e uppl.)Não informado. Programmed Learning and Educational Technology. London: Association for Programmed Learning, 1966.
MLA-referens (8:e uppl.)Não informado. Programmed Learning and Educational Technology. Association for Programmed Learning, 1966.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.