British Railways Operating Manual D5000-D5175 AEI/Sulzer
British Railways Operating Manual – Locomotives D5000–D5175
British Railways Operating Instructions Spanner MKIII Train Heat Boilers
CLASS 40 ENGLISH ELECTRIC TYPE 4 BRITISH RAILWAYS OPERATING MANUAL D200 1961
The Times British Railways: illustrated history of a national institution
Xpress Operating British Railways History Volume 1 , 2.