Gest@o.com / Eduardo Correia...[et al.]
Practical data communications / Roger L. Freeman
Das contraordenações : breves notas sobre o regime contraordenacional em geral, as contraordenações fiscais e as atinentes à segurança social / David Valente Borges de Pinho
OECD guidelines for the security of information systems and networks : towards a culture of security / Organisation for Economic co-Operation and Development