Não informado. (2012). The American Journal of Distance Education. Pennsylvania State University, College of Education, Office for Distance Education.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. The American Journal of Distance Education. University Park, Pa: Pennsylvania State University, College of Education, Office for Distance Education, 2012.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. The American Journal of Distance Education. Pennsylvania State University, College of Education, Office for Distance Education, 2012.
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