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Disponível:http://www.sfactory.co.za/downloads/The%20History%20of%20Video%20Surveillance.pdf;

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URL: http://www.wisegeek.com/what-is-cctv.htm;

URL: http://www.howtosurveillance.com/;

H. Kruegle, CCTV Surveillance: Analog and Digital Video Practices and Technologies, 2nd ed., Burlington: Elsevier Butterworth-Heinemann, 2007, pp. 201 e 286-287.

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Disponível: http://www.axis.com/documentation/whitepaper/video/cctv_to_ipsurveillance.htm

Vigilância IP Axis, Axis Communications, 2012 [Online].
Disponível: http://www.axis.com/files/brochure/bc_ipsurv_45185_br_1202_lo.pdf

C. Roseiro, P. Torres e J. Salvado, “NetEye – Vídeo Vigilância Baseada em Tecnologia IP”, Escola Superior de Tecnologia IPCB, Abril 2008.
Disponível: http://www.est.ipcb.pt/pessoais/pedrotorres/Documentos/Artigo_NetEye.pdf

URL: http://www.cctvcamerapros.com/Surveillance-DVR-FAQ-s/61.htm

 Martins Durães, Daniel, “ Arquitectura de sistema de vigilância integrada”, Dissertação, Dept. Elect. Eng., FEUP, Junho 2008.

Capella Júnior, Alfredo, “Estudo e Implementação de Sistema de Vídeo – Vigilância Inteligente”, Dissertação, Dept. Engenharia Informática Universidade Federal do Rio Grande do Sul, Julho 2010.

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URL: http://www.axis.com/pt/

URL: http://www.cnpd.pt/bin/legis/nacional/Lei1-2005-vvgpolicias.pdf

URL: http://www.tsf.pt/PaginaInicial/Portugal/Interior.aspx?content_id=1736911

 URL: http://www.grupopolicom.com.br/avigilon/doc1.pdf

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URL: http://www.theverge.com/2012/3/23/2896525/new-surveillance-system-compare-your-face-against-36-million-others-in-one-second