Honour, T. F., author
Bina Aksara , 1988
Buku Teks
Castles, Lance, author
Pustaka Sinar Harapan, 1982
Buku Teks
Watson, Tony J., author
Routledge, 1995
Buku Teks
Miller, Delbert C.
Harper & Row, 1964
Buku Teks
Watson, Tony J., author
Routledge, 1995
Buku Teks