Colectânea de legislação da segurança social / comp. Margarida Silva
Propagation of radiowaves / ed. M. P. M. Hall, L. W. Barclay and M. T. Hewitt
Computer solutions for business : planning and implementating a successful computer environment / Doug Dayton
Official microsoft intranet solutions : using microsoft office 97 and frontpage 97 / ed. Micro Modelling Associates