D. F. Howard
- 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. Dugald Clerk Lecture. Dans: Proceedings of the Institution of Civil Engineers, v. 66, n. 3 (août 1979). (1979):