Não informado. (1980). Distance education. University of Southern Queensland, Distance Education Centre.
Čikaški stil citiranja (17. izdanje)Não informado. Distance Education. Toowoomba, Australia: University of Southern Queensland, Distance Education Centre, 1980.
MLA način citiranja (8. izdanje)Não informado. Distance Education. University of Southern Queensland, Distance Education Centre, 1980.
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