Trolleybuses
Bradford City Transport
Trolleybuses in Bradford - 50 Years of Trolleybuses 1911 - 1961
BREARLEY, H. & BEACH, David T.
Under Two Liveries - An account of all known trolleybuses to be owned and operated by more than one British trolleybus system
CANNEAUX, T.P. & HANSON, N.H.
The Trolleybuses of Newcastle Upon Tyne 1935 - 1966
including details of the proposed trolleybus operations in Gateshead