Welcome to the Worldwide Greathead family my One-Name Study - Sources
- [S62] E-mails between Stephen Shawcross and Jan Cooper from 9 August 2004.
- [S72] E-mails between Ray Salmons and Jan Cooper from 24 August 2004.
- [S77] E-mails between Joan Whitfield and Jan Cooper from 1 October 2004.
- [S86] E-mails between Pauline Mounsey and Jan Cooper from 8 December 2004 Some of the information has been taken with permission from Pauline's family tree placed on Roots web.com.
- [S126] E-mails between John Hine and Jan Cooper from 12 October 2005.
- [S178] E-mails between Agnes McCaul and Jan Cooper from 12 December 2006.
- [S285] E-mails between Alan Hogan and Jan Cooper from 8 January 2010.
- [S286] E-mails between Ryan Tully and Jan Cooper from 4 January 2010.
- [S306] Information gleaned from book Guys Cliffe - Back to its roots by Bob Dixon, Recollections of a Country Mansion by Terry Roberts or from Friends of Guys Cliffe Chairman.
- [S311] Emails between Charles Wright and Jan Cooper from 9 November 2010.
- [S318] Emails between Patti Taylor and Jan Cooper from 28 January 2011.
- [S440] E-mails between Julie Wilson and Jan Cooper from 24 March 2017 title.
- [S532] E-mails between John Martin and Jan Cooper from 19 September 2018.
- [S8281] E-mails between Ken Cox and Jan Cooper from 20 January 2015.
- [S12037] Emails between Andrew M Bergman and Jan Cooper from 9 June 2006.
- [S18575] Emails between Charles Tullock and Jan Cooper from 20 April 2004.
- [S20313] Correspondence between Mary Szalay née Ferris and Jan Cooper from 21 January 2007.
- [S21577] Letters between Joan Bygrave and Jan Cooper from 8 January 2006.
- [S26674] Emails between Tyson Greathead and Jan Cooper 2013.
- [S26878] E-mails between Jacki and Jan Cooper from 16 June 2011.
- [S27261] E-mails between Sarah Jerman and Jan Cooper from 16 August 2011.
- [S31982] E-mails between Ceri Galloway and Jan Cooper from 1 November 2015 title.
- [S33436] E-mails between Patricia Nash and Jan Cooper from 24 February 2019.
- [S40036] Eton College Library.
- [S41925] US Census NY 1825 - 1 June 1925.