Stromberg, Roland N.
Prentice-Hall, 1997
Buku Teks
Black, C.E., author
Alfred A. Knopf, 1966
Buku Teks
BUrgess, 1975
Buku Teks
edited by Alexander Baltzly, A. William Salomone
Appleton-Century-Crofts, 1950
Buku Teks
Taylor, Alan John Percivale, 1906-1990, author
Penguin Books in association with Hamish Hamilton, 1967
Buku Teks