Segurança de TI [documento electrónico] : sondagem e previsões, 2007-2012 / Orlando Bandeira de Almeida
Malicious software (malware) [documento electrónico] : security threat to the internet economy: ministerial background report / Organisation for Economic co-Operation and Development
Segurança de TI [documento electrónico] / Ed. IDC Portugal
Guide to computer network security / Joseph Migga Kizza