Dampier, William Cecil
Cambridge University Press, 1989
Buku Teks SO
Butterfield, Herbert
Free Press, 1957
Buku Teks SO
Singer, Charles
Clarendon Press, 1962
Buku Teks SO
Hutten, Ernest H.
Greenwood Press, 1978
Buku Teks SO
Gillispie, Charles Coulston
Princeton University Press, 1960
Buku Teks SO