British star Colin Firth becomes Italian citizen following Brexit decision. Associated Press [online]. 2017-09-23 [cit. 2021-04-07]. Dostupné online. (anglicky)
Colin Firth's wife Livia refuses to let the sun set on her eco dream. The Telegraph [online]. [cit. 2021-04-07]. Dostupné online. (anglicky)
SQUIRES, Nick. Colin Firth applies for Italian citizenship. The Telegraph. 2017-05-23. Dostupné online [cit. 2021-04-07]. ISSN0307-1235. (anglicky)
SQUIRES, Nick. Colin Firth becomes Italian citizen amid 'uncertainty' but says he will always be 'extremely British'. The Telegraph. 2017-09-23. Dostupné online [cit. 2021-04-07]. ISSN0307-1235. (anglicky)
STAFF, Guardian. A reluctant heart-throb. the Guardian [online]. 2001-03-31 [cit. 2021-04-07]. Dostupné online. (anglicky)
Colin Firth wins a star on Hollywood's Walk of Fame. web.archive.org [online]. 2013-10-31 [cit. 2021-04-07]. Dostupné varchivu pořízeném zoriginálu dne2013-10-31.
MONIUSZKO, Sara M. Colin Firth and Livia Giuggioli announce separation after 22 years of marriage. USA TODAY [online]. [cit. 2021-04-07]. Dostupné online. (anglicky)
William Joseph Firth - About William Joseph Firth. web.archive.org [online]. 2015-07-09 [cit. 2021-04-07]. Dostupné varchivu pořízeném zoriginálu dne2015-07-09.
Colin Firth - Film Actor - Biography.com. web.archive.org [online]. 2015-11-21 [cit. 2021-04-07]. Dostupné varchivu pořízeném zoriginálu dne2015-11-21.
Colin Firth wins a star on Hollywood's Walk of Fame. web.archive.org [online]. 2013-10-31 [cit. 2021-04-07]. Dostupné varchivu pořízeném zoriginálu dne2013-10-31.
"Piers" Preview: "King's Speech" star Firth 'likes voting'; unelected institutions 'a problem' – Piers Morgan - CNN.com Blogs. web.archive.org [online]. 2011-07-22 [cit. 2021-04-07]. Dostupné varchivu pořízeném zoriginálu dne2011-07-22.
The Denver Post [online]. 2011-01-28 [cit. 2021-04-07]. Dostupné varchivu pořízeném dne2023-02-10. (anglicky)
William Joseph Firth - About William Joseph Firth. web.archive.org [online]. 2015-07-09 [cit. 2021-04-07]. Dostupné varchivu pořízeném zoriginálu dne2015-07-09.
SQUIRES, Nick. Colin Firth applies for Italian citizenship. The Telegraph. 2017-05-23. Dostupné online [cit. 2021-04-07]. ISSN0307-1235. (anglicky)
SQUIRES, Nick. Colin Firth becomes Italian citizen amid 'uncertainty' but says he will always be 'extremely British'. The Telegraph. 2017-09-23. Dostupné online [cit. 2021-04-07]. ISSN0307-1235. (anglicky)