Dutton, Geoffrey, author
Collins, 1967
Buku Teks
Spengler, Joseph J. (Joseph John), 1902-1991, author
Duke Univrsity Press, 1979
Buku Teks
Dunlop, John B, author
Princeton University Press, 1983
Buku Teks
Sligo, John
Penguin Books, 1990
Buku Teks
Bailey, Thomas Andrew, 1902-1983, author
Cornell University Press, 1950
Buku Teks