"History". Transport for London. Diarkibkan daripada yang asal pada 2013-01-16. Dicapai pada 31 May 2009.
"Key facts". Transport for London. Diarkibkan daripada yang asal pada 2018-12-26. Dicapai pada 31 May 2009.
All Usage statistics (total entry plus exits) are in millions per year for 2008 – "Customer metrics -> Entries and exits -> 2008". Transport for London. Diarkibkan daripada yang asal pada 2011-06-04. Dicapai pada 2009-05-07.. TfL does not publish usage data for the DLR.
Blackfriars underground station closed on 2 March 2009 for reconstruction in conjunction with the rebuilding of the main line station. The station is due to reopen in late 2011 – "Blackfriars to undergo major improvement". Transport for London. 9 February 2009. Diarkibkan daripada yang asal pada 2010-01-29. Dicapai pada 2009-05-14.
web.archive.org
"History". Transport for London. Diarkibkan daripada yang asal pada 2013-01-16. Dicapai pada 31 May 2009.
"Key facts". Transport for London. Diarkibkan daripada yang asal pada 2018-12-26. Dicapai pada 31 May 2009.
All Usage statistics (total entry plus exits) are in millions per year for 2008 – "Customer metrics -> Entries and exits -> 2008". Transport for London. Diarkibkan daripada yang asal pada 2011-06-04. Dicapai pada 2009-05-07.. TfL does not publish usage data for the DLR.
webarchive.org.uk
Blackfriars underground station closed on 2 March 2009 for reconstruction in conjunction with the rebuilding of the main line station. The station is due to reopen in late 2011 – "Blackfriars to undergo major improvement". Transport for London. 9 February 2009. Diarkibkan daripada yang asal pada 2010-01-29. Dicapai pada 2009-05-14.
worldcat.org
Rose, Douglas (1999). The London Underground, A Diagrammatic History. London: Douglas Rose/Capital Transport. ISBN1-85414-219-4. OCLC59556887.