Shropshire
-
Cragg, Roger (1997): Civil Engineering Heritage. Wales and West Central England. 2ème édition, Londres (Royaume-Uni), ISBN 9780727746115, pp. 309.
https://doi.org/10.1680/cehwawce.25769
-
Madelin, K. B. (1994): Highway maintenance management in Shropshire. Dans: Proceedings of the Institution of Civil Engineers - Transport, v. 105, n. 2 (mai 1994), pp. 97-103.
https://doi.org/10.1680/itran.1994.26366
-
Cranage, D. H. S. (1954): Shropshire. Dans: Transactions of the Ancient Monuments Society, v. 2 ( 1954).