Keylor, William R., 1944-
The twentieth-century world : an international history
Oxford University Press, 1996
Buku Teks
Twentieth-century building materials : history and conservation / edited by Thomas C. Jester
McGraw-Hill, 1995
Buku Teks
Black, C.E.
Twentieth Century Europa: a history
Alfred A. Knopf, 1961
Buku Teks
Black, C.E.
Twentieth Century Europe: a history
Alfred A. Knopf, 1966
Buku Teks
Nichols, Jeannette P.
Twentieth century United States : a history
D. Appleton-Century, 1943
Buku Teks