P. Layfield
- Tyne and Wear Metro: Management of the Project. Dans: Proceedings of the Institution of Civil Engineers, v. 70, n. 4 (novembre 1981). (1981):
- Tyne and Wear Metro: Concept, Organization and Operation. Dans: Proceedings of the Institution of Civil Engineers, v. 70, n. 4 (novembre 1981). (1981):
- Tyne and Wear Metro: Bridge N 106 Over the River Tyne. Dans: Proceedings of the Institution of Civil Engineers, v. 66, n. 2 (mai 1979). (1979):