Holmberg, B. (2003). Distance education in essence - An ... · The evolution of the character and practice of distance education ... Oxford. 1894, students for ... the Corresp:ndence
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Holmberg, B. (2003). Distance education in essence - An overview of theory and practice in the early twenty-first century (2nd ed.). Oldenburg:Bibliotheks- und Informationssystem der Universität Oldenburg. pp. 107-113 107