"Company History". Barclays Newsroom: Business History. Barclays. Diarsipkan dari versi asli tanggal 2009-01-31. Diakses tanggal 30 January 2007. See also: Barclays: The Business of Banking, 1690–1996 by Margaret Ackrill and Leslie Hannah; Cambridge UP, 2001 ISBN0-521-79035-2
"Company History". Barclays.lk – About us: Our History | 1690–1972. Barclays. Diarsipkan dari versi asli tanggal 2009-01-31. Diakses tanggal 11 May 2008.
European Association for Banking History (1994). Pohl, Manfred; Freitag, Sabine, ed. Handbook on the history of European banks. Aldershot, Hants, England: E. Elgar. hlm. 1198–1199. ISBN9781781954218. Diakses tanggal 10 October 2014.
"Insert card here". CIO Magazine. July 1988. Diakses tanggal 4 May 2012.
"Wem gehört die Welt?" [Who owns the world?] (PDF). Die Zeit (dalam bahasa Jerman). 31 March 2012. Diarsipkan dari versi asli(PDF) tanggal 4 October 2016. Diakses tanggal 16 August 2017.Parameter |url-status= yang tidak diketahui akan diabaikan (bantuan)
"Company History". Barclays Newsroom: Business History. Barclays. Diarsipkan dari versi asli tanggal 2009-01-31. Diakses tanggal 30 January 2007. See also: Barclays: The Business of Banking, 1690–1996 by Margaret Ackrill and Leslie Hannah; Cambridge UP, 2001 ISBN0-521-79035-2
"Company History". Barclays.lk – About us: Our History | 1690–1972. Barclays. Diarsipkan dari versi asli tanggal 2009-01-31. Diakses tanggal 11 May 2008.
"Wem gehört die Welt?" [Who owns the world?] (PDF). Die Zeit (dalam bahasa Jerman). 31 March 2012. Diarsipkan dari versi asli(PDF) tanggal 4 October 2016. Diakses tanggal 16 August 2017.Parameter |url-status= yang tidak diketahui akan diabaikan (bantuan)