Não informado. (2012). The American Journal of Distance Education. Pennsylvania State University, College of Education, Office for Distance Education.
Citação do estilo Chicago (17ª ed.)Não informado. The American Journal of Distance Education. University Park, Pa: Pennsylvania State University, College of Education, Office for Distance Education, 2012.
Citação MLA (8ª ed.)Não informado. The American Journal of Distance Education. Pennsylvania State University, College of Education, Office for Distance Education, 2012.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.