FREER, J. R. (1990). COMPUTER COMMUNICATIONS AND NETWORKS. MCGRAW HILL.
Lua i Stíl Chicago (17ú heag.)FREER, J R. COMPUTER COMMUNICATIONS AND NETWORKS. -: MCGRAW HILL, 1990.
Lua MLA (9ú heag.)FREER, J R. COMPUTER COMMUNICATIONS AND NETWORKS. MCGRAW HILL, 1990.
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