Sources: https://gfw.report https://www.ualberta.ca/china-institute/news/the-latest/2018/december/chinas-great-firewall.html https://theintercept.com/2019/07/11/china-surveillance-google-ibm-semptian/ https://web.archive.org/web/20170712050448/http://www.prnewswire.co.uk/news-releases/nortel-networks-signs-contracts-valued-at-over-us-dollars-120-million-during-canadian-prime-minister-jean-chretiens-visit-to-china-156751255.html https://archive.ph/edEzZ https://gfwatch.org/ https://cs.stanford.edu/people/eroberts/cs181/projects/2010-11/FreedomOfInformationChina/the-great-firewall-of-china-background/index.html https://ifex.org/freedom-house-report-finds-global-internet-freedom-in-decline-for-the-11th-consecutive-year/ https://en.wikipedia.org/wiki/Great_Firewall https://en.wikipedia.org/wiki/Internet_censorship_in_China https://en.wikipedia.org/wiki/Internet_censorship_and_surveillance_by_country