Varrall, G. (2012). Making telecoms work: From technical innovation to commercial success. Wiley.
Lua i Stíl Chicago (17ú heag.)Varrall, Geoffrey. Making Telecoms Work: From Technical Innovation to Commercial Success. Hoboken, NJ: Wiley, 2012.
Lua MLA (9ú heag.)Varrall, Geoffrey. Making Telecoms Work: From Technical Innovation to Commercial Success. Wiley, 2012.
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