1. Acworth, W.M. 1899. “‘The Railways of England’”. Edited by: Murray, John. 470–471. London
2. The Spanish National Railways Class;Cox E.S.,1966
3. Le Fleming, H.M. “‘Illustrated Survey of Modern Steam Locomotives’”. 319–385.
4. Ransome‐Wallis, P. 1959. “‘Concise Encyclopedia of World Railway Locomotives”. London: Hutchinson.