Gage, John D., author
Cambridge University Press, 1992
Buku Teks
Yuwen Li
Martinus Nijhoff Publishers, 1994
Buku Teks
Glasby, John S., author
Ellis Horwood, 1992
Buku Referensi
Fried, George H., author
McGraw-Hill, 1995
Buku Teks
Universitas Indonesia, 1992
UI - Skripsi (Membership)