Gras, Norman Scott Brien
History of agriculture in Europe and America
F.S. Crofts, 1946
 Buku Teks
Hayes, Carlton J. H.
A political and cultural history of modern Europe
Macmillan, 1932
 Buku Teks
Becker, Carl L. (Carl Lotus), 1873-1945
History of modern Europe : course one absolute government and democratic revolution
Silver Burdett, 1944
 Buku Teks
Cochran, Thomas C.
The Age of enterprise : a social history of industrial America
Macmillan, 1947
 Buku Teks
Becker, Carl L. (Carl Lotus), 1873-1945
History of modern Europe. Course one absolute government and democratic revolution : a self-teaching course, based on modern history
Silver Burdett, 1944
 Buku Teks