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Baris 22: * [http://www.davros.org/phones/btnetwork.html Clive Feather's guide to the BT network] * [http://www.du.edu/~jcalvert/tech/phones.htm Basic Telephones Technology] * [http://www.rhaworth.myby.co.uk/phreak/tenp_01.htm Roger W. Haworth's guide to London (UK) Director Exchange Names] {{Webarchive\|url=https://web.archive.org/web/20140525024839/http://www.rhaworth.myby.co.uk/phreak/tenp_01.htm \|date=2014-05-25 }} * [~~http~~https://~~wayback~~web.archive.org/web/20130302120900/http://www.cr.nps.gov/nhl/DOE_dedesignations/Telephone.htm National Park Service's page about the first telephone exchange] * [http://www.google.com/patents?id=xL9WAAAAEBAJ&dq=252576 patent 252,576 for the first telephone switchboard in 1881] * [http://www.adslgeek.com/dslforum/index.php?topic=207.0 A Telecom Exchange Tour in NZ]

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