Graebner, Norman A., author
McGraw-Hill, 1975
Buku Teks
Bailey, Thomas Andrew, 1902-1983, author
D.C. Health, 1983
Buku Teks
Morison, Samuel Eliot, author
Oxford University Press, 1949
Buku Teks
Todd, Lewis Paul, author
Harcourt, Brace & World, 1961
Buku Teks
Gabriel, Ralph Henry, 1890-1987, author
D. Appleton-Century, 1942
Buku Teks