Info-zdroje
Zlato světa, vydané Fortuna Print, Praha, 2005
http://rg.ancients.info/lion/article.html
http://www.londonmintoffice.org/gold-sovereign-guide
http://en.wikipedia.org/wiki/Sovereign_(British_coin)
http://www.goldsovereigns.co.uk/firstsovereign.html
http://www.coins-of-the-uk.co.uk
http://british-coin-price-guide.homelinux.com