Robbins, Michael (26 October 2012). "The Early Years of Electric Traction". The Journal of Transport History. 21 (1): 92–101. doi:10.7227/TJTH.21.1.6. S2CID109210400
Robbins, Michael (26 October 2012). "The Early Years of Electric Traction". The Journal of Transport History. 21 (1): 92–101. doi:10.7227/TJTH.21.1.6. S2CID109210400