Hall, Walter Phelps
Appleton-Century-Crofts, 1957
Buku Teks
Black, C.E., author
Alfred A. Knopf, 1966
Buku Teks
Stromberg, Roland N.
Prentice-Hall, 1997
Buku Teks
BUrgess, 1975
Buku Teks
Taylor, A.J.P. (Alan John Percivale), 1906-1990, author
Penguin Books in association with Hamish Hamilton, 1967
Buku Teks