For Forbes, see John L. Larson, Bonds of Enterprise: John Murray Forbes and Western Development in America's Railway Age, expanded Edition (Iowa City: University of Iowa Press, 2001), particularly 53-109.

Supple and Johnson, Boston Capitalists, 197-98.

Richard Overton, Perkins/Budd: Railway Statesmen of the Burlington (Westport: Greenwood Press, 1982), 3.