Benns, Lee F.
European history since 1870
Appleton-Century-Crofts, 1955
 Buku Teks SO
Tostlebe, Alvin S.
Capital in agiculture its formation and financing since 1870 Alvin S. Tostlebe
Princenton University Press , 1957
 Buku Teks
Krout, John A.
United States Since 1865
Barnes & Noble, 1962
 Buku Teks SO
Hacker, Louis M.
The United States since 1865
Appleton-Century-Crofts, 1949
 Buku Teks SO
Woytinsky, W.S.
World population and production trends and outlook
Twentieth Century Fund, 1953
 Buku Teks