Não informado. (1979). Educational communication and technology. Association for Educational Communications and Technology.
শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতিNão informado. Educational Communication and Technology. Washington: Association for Educational Communications and Technology, 1979.
M.L.A (8 ম সংস্করণ) উদ্ধৃতিNão informado. Educational Communication and Technology. Association for Educational Communications and Technology, 1979.
সতর্কবাণী: সাইটেশন সবসময় 100% নির্ভুল হতে পারে না.