Cross, Amanda
Ballantine books, 1989
Buku Teks SO
Vatikiotis, Michael R.J.
Routledge, 1998
Buku Teks SO
Lyttle, Richard B.
Atheneum, 1987
Buku Teks SO
Jones, F.C.
Oxford University Press, 1954
Buku Teks SO
Sea-Jin, Chang
Cambridge Cambridge University Press 2003
Buku Teks