TISAL, J. (2001). GSM NETWORK (2ND.). JOHN WILEY & SONS.
Lua i Stíl Chicago (17ú heag.)TISAL, JOACHIM. GSM NETWORK. 2ND. NEW YORK: JOHN WILEY & SONS, 2001.
Lua MLA (9ú heag.)TISAL, JOACHIM. GSM NETWORK. 2ND. JOHN WILEY & SONS, 2001.
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