Number portability 2001 : documentação da Conferência: Praga, 24- 26 de setembro de 2001 / org. IIR Telecoms & Technology
European telecomms regulations and policy documents / ed. CommEd Ltd
1999 Super frequency list : on cd-rom / ed. Klingenfuss Publications
IEE requirements for Electrical Installations including BS 7671 : 1992: The wiring regulations: version 1 / Institution of Electrical Engineers