Thistlethwaite, Frank, author
Cambridge University Press, 1955
Buku Teks
Graebner, Norman A., author
McGraw-Hill, 1975
Buku Teks
Bailey, Thomas Andrew, 1902-1983, author
Prentice-Hall, 1980
Buku Teks
D.C. Heath and Company, 1992
Buku Teks
Brinkley, Alan, author
McGraw-Hill, 1997
Buku Referensi