Clark, K.L., author
Prentice-Hall, 1984
Buku Teks
Gibbins, Peter, author
Clarendon Press, 1988
Buku Teks
Maier, David, author
The Benjamin Cumming Pub., 1988
Buku Teks
Short, Kenneth L.
Prentice-Hall, 1981
Buku Teks
Diah Kusumawati, author
Universitas Indonesia, 1988
UI - Skripsi (Membership)