SINCLAIR, Angus. Development of the locomotive engine [online]. New York: A. Sinclair publishing company, 1907 [cit. 2011-06-26]. Dostupné online. (anglicky)
SECON, G. A. The Evolution of the Steam Locomotive 1803 to 1898 [online]. The Railway Publishing CO., Ltd, 1899 [cit. 2011-06-26]. Dostupné online. (anglicky)[nedostupný zdroj]
BROWN, William H. The History of the First Locomotives In America: Chapter VI. TREVITHICK'S ENGINE [online]. D. Appleton And Company, 1871 [cit. 2011-06-26]. Dostupné online. (anglicky)