Piccadilly Line
- Extension of the Piccadilly Line from Hounslow West to Heathrow Central. Dans: Proceedings of the Institution of Civil Engineers, v. 60, n. 2 (mai 1976), pp. 191-218. (1976):
- Extension of the Piccadilly Line to Terminal 4, Heathrow. Dans: Proceedings of the Institution of Civil Engineers, v. 78, n. 6 (décembre 1985), pp. 1261-1278. (1985):