A Sequel to The Philosophy of Railroads: Facsimile of Keefer's 1856 publication.
Keefer, Thomas C. M.Inst. C.E.,C.M.G.: Short biography from Access Genealogy.
Keefer, Thomas Coltrin: Biography and references by H. V. Nelles from Canadian Biography Online.
Philosophy of Railroads: Facsimile of Keefer's 1853 publication for the directors of the St. Lawrence and Ottawa Grand Junction Railway Company.