Não informado. (2012). The American Journal of Distance Education. Pennsylvania State University, College of Education, Office for Distance Education.
Chicago-referens (17:e uppl.)Não informado. The American Journal of Distance Education. University Park, Pa: Pennsylvania State University, College of Education, Office for Distance Education, 2012.
MLA-referens (8:e uppl.)Não informado. The American Journal of Distance Education. Pennsylvania State University, College of Education, Office for Distance Education, 2012.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.