Northern line (Danish Wikipedia)

"Call for action on Northern Line". BBC News. 12. oktober 2005. Hentet 10. juni 2008.
"Travel Delays as Tube Line Shut". BBC News. London. 13. oktober 2005. Hentet 30. juni 2008.

galegroup.com

infotrac.galegroup.com

"London Tubes' New Names – Northern And Central Lines". The Times (47772): 12. 25. august 1937. Hentet 18. maj 2009.(kræver abonnement)

gazettes-online.co.uk

London Gazette: no. 28665, page 8798, 22. november 1912.
London Gazette: no. 27380, page 8200, 26. november 1901.
London Gazette: 0&geotype=London&gpn=8314&type=ArchivedIssuePage&all=&exact=&atleast=&similar= no. 3277 0, pages 8314–8315, 24. november 1922.

nce.co.uk

Rowson, Jessica (26. juni 2008). "Battersea Power Station's £4bn plan to hinge on Tube extension". New Civil Engineer. London. Hentet 6. juli 2008.{{cite news}}: CS1-vedligeholdelse: url-status (link)

redantdev.com

wts.uat.redantdev.com

"Transport 2025 – Transport Vision for a Growing World" (PDF). Transport for London. 11. november 2006. Arkiveret fra originalen (PDF) 15. juli 2011. Hentet 21. juli 2008.

tfl.gov.uk

"Northern line facts". Transport for London. Arkiveret fra originalen 12. marts 2012. Hentet 12. marts 2012.
"LU Performance Data Almanac". Transport for London. 2011-2012. Arkiveret fra originalen 3. august 2012. Hentet 1. august 2012.{{cite web}}: CS1-vedligeholdelse: Dato-format (link)
Transport for London (13. oktober 2005). "No Service on the Northern Line". Pressemeddelelse.
"Bicycle Tube Map" (PDF). Transport for London. januar 2008. Arkiveret fra originalen (PDF) 16. september 2008. Hentet 30. juni 2008.

thisislocallondon.co.uk

Stebbings, Peter (11. september 2006). "Five more years of Northern line pain". This Is Local London. Hentet 26. august 2008.

tubelines.com

"Map of Upgrades" (PDF). Tube Lines. Arkiveret (PDF) fra originalen 6. april 2008. Hentet 30. juni 2008.
"Network Tests for New Signalling Systems". Tube Lines. 2008-07-21.

wandsworth.gov.uk

London Borough of Wandsworth (11. november 2010). "Battersea Power Station scheme approved". Pressemeddelelse. Hentet 25. februar 2012. Arkiveret fra originalen den 14. oktober 2013.

web.archive.org

"Northern line facts". Transport for London. Arkiveret fra originalen 12. marts 2012. Hentet 12. marts 2012.
"LU Performance Data Almanac". Transport for London. 2011-2012. Arkiveret fra originalen 3. august 2012. Hentet 1. august 2012.{{cite web}}: CS1-vedligeholdelse: Dato-format (link)
"Underground Journeys: Moving Underground". www.architecture.com. Royal Institute of British Architects. Arkiveret fra originalen 4. maj 2011. Hentet 20. februar 2011.
"Underground Journeys: South Wimbledon". www.architecture.com. Royal Institute of British Architects. Arkiveret fra originalen 7. juli 2011. Hentet 20. februar 2011.
"Map of Upgrades" (PDF). Tube Lines. Arkiveret (PDF) fra originalen 6. april 2008. Hentet 30. juni 2008.
"Bicycle Tube Map" (PDF). Transport for London. januar 2008. Arkiveret fra originalen (PDF) 16. september 2008. Hentet 30. juni 2008.
"Transport 2025 – Transport Vision for a Growing World" (PDF). Transport for London. 11. november 2006. Arkiveret fra originalen (PDF) 15. juli 2011. Hentet 21. juli 2008.
"Camden Town Redevelopment". Alwaystouchout.com. 25. januar 2006. Arkiveret fra originalen 11. november 2007. Hentet 30. juni 2008.
London Borough of Wandsworth (11. november 2010). "Battersea Power Station scheme approved". Pressemeddelelse. Hentet 25. februar 2012. Arkiveret fra originalen den 14. oktober 2013.
"Proposal for a Northern Line Extension to Nine Elms & Battersea" (PDF). Battersea Power Station. 2008. Arkiveret fra originalen (PDF) 17. september 2011. Hentet 11. juli 2010.