Yorkshire & The Humber
KING, J.S.
Bradford Corporation Trolleybuses
The story of Britain's longest lived trolleybus undertaking
Kingston upon Hull City Transport
KHCT 1899 - 1979: An Illustrated History of Kingston upon Hull City Transport
LEDGARD, R.S.
Early Turn / Split Turn / Late Turn: Bradford and Trolleybuses 1960 - 1972
Three volumes covering Bradford trolleybuses in their final ten years, illustrated throughout with the authors photographs.