GUPTA, N. K. (2000). THE BUSINESS OF TELECOMMUNICATION. TATA MCGRAW HILL.
Chicago-čujuhus (17. p.)GUPTA, N K. THE BUSINESS OF TELECOMMUNICATION. NEW DELHI: TATA MCGRAW HILL, 2000.
MLA-čujuhus (9. p.)GUPTA, N K. THE BUSINESS OF TELECOMMUNICATION. TATA MCGRAW HILL, 2000.
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