Shropshire

1. Cragg, Roger (1997): Civil Engineering Heritage. Wales and West Central England. 2. Ausgabe, London (Großbritannien), ISBN 9780727746115, S. 309.

   https://doi.org/10.1680/cehwawce.25769

2. Madelin, K. B. (1994): Highway maintenance management in Shropshire. In: Proceedings of the Institution of Civil Engineers - Transport, v. 105, n. 2 (Mai 1994), S. 97-103.

   https://doi.org/10.1680/itran.1994.26366

3. Cranage, D. H. S. (1954): Shropshire. In: Transactions of the Ancient Monuments Society, v. 2 ( 1954).