Não informado. (2012). The American Journal of Distance Education. Pennsylvania State University, College of Education, Office for Distance Education.
শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতিNão informado. The American Journal of Distance Education. University Park, Pa: Pennsylvania State University, College of Education, Office for Distance Education, 2012.
M.L.A (8 ম সংস্করণ) উদ্ধৃতিNão informado. The American Journal of Distance Education. Pennsylvania State University, College of Education, Office for Distance Education, 2012.
সতর্কবাণী: সাইটেশন সবসময় 100% নির্ভুল হতে পারে না.