Johnson, Simon creator text New York McGraw-Hill/Osborne 2004 monographic xviii, 316 p.: ill.; 24 cm "Safeguard your children against threats that lurk on the internet, including pedophiles, cyber-stalkers, cyber-bullies, pop-up, pornography, etc ...."-- Cover Simon Johnson Internet and children Computer network resources Evaluation Computer networks Access control Computer networks Security measures Internet Access control Internet Security measures 0072257415 UMP 20251117142145.0 vtls000006639