"Sewell Cutting". Wildlife Trust for Bedfordshire, Cambridgeshire and Northamptonshire. Archived from the original on 5 September 2015. Retrieved 10 September 2015.
wildlifebcn.org
"Sewell Cutting". Wildlife Trust for Bedfordshire, Cambridgeshire and Northamptonshire. Archived from the original on 5 September 2015. Retrieved 10 September 2015.