por Norton, Peter, 1943- [autor] | Nielsen, Paul [autor] | Palmas Velasco, Óscar Alfredo [traductor] | Norton, Peter, 1943-. Inside norton antivirus.
por Gross, Michael, 1966- [autor] | Tejera, Héctor G [traductor] | Gross, Michael, 1966-. Norton utilities 6 instant reference.