Graebner, Norman A.
McGraw-Hill, 1975
Buku Teks
Brinkley, Alan
McGraw-Hill, 1997
Buku Referensi
D.C. Heath and Company, 1992
Buku Teks
Adams, James Truslow
1946
Buku Referensi
editor Thomas C. Cochran, Wayne Andrew
Charles Scribner's Sons , 1962
Buku Referensi