Sommerlad, E. L. (1975). National communication systems: Some policy issues and options. Unesco.
Čikaški stil citiranja (17. izdanje)Sommerlad, Ernest Lloyd. National Communication Systems: Some Policy Issues and Options. Paris: Unesco, 1975.
MLA način citiranja (9. izdanje)Sommerlad, Ernest Lloyd. National Communication Systems: Some Policy Issues and Options. Unesco, 1975.
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