"Barton Mills Valley". Local Nature Reserves. Natural England. 26 March 2013. Archived from the original on 28 April 2017. Retrieved 4 June 2017.
sssi.naturalengland.org.uk
"Breckland Forest citation"(PDF). Sites of Special Scientific Interest. Natural England. Archived from the original(PDF) on 4 March 2016. Retrieved 23 May 2017.
"Barton Mills Valley". Local Nature Reserves. Natural England. 26 March 2013. Archived from the original on 28 April 2017. Retrieved 4 June 2017.
"Breckland Forest citation"(PDF). Sites of Special Scientific Interest. Natural England. Archived from the original(PDF) on 4 March 2016. Retrieved 23 May 2017.