Não informado. (1966). Programmed learning and educational technology. Association for Programmed Learning.
শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতিNão informado. Programmed Learning and Educational Technology. London: Association for Programmed Learning, 1966.
M.L.A (8 ম সংস্করণ) উদ্ধৃতিNão informado. Programmed Learning and Educational Technology. Association for Programmed Learning, 1966.
সতর্কবাণী: সাইটেশন সবসময় 100% নির্ভুল হতে পারে না.