10 Downing Street - Duke of Newcastle - Biography of Thomas Pelham-Holles, Duke of Newcastle, Prime Minister 1754-6; 1757-62. - http://www.pm.gov.uk/output/Page170.asp
Thomas Pelham-Holles, Duke of Newcastle - Biography and links to related articles. - http://www.dialspace.dial.pipex.com/town/terrace/adw03/pms/newcastl.htm
The Duke of Newcastle (1693-1768) - Short historical biography on one of the most influential ministers in Great Britain during the critical years when France and England fought over their possessions in North America. - http://www.blupete.com/Hist/BiosNS/1700-63/Newcastle.htm