Yuwen Li
Martinus Nijhoff Publishers, 1994
Buku Teks
Glasby, John S.
Ellis Horwood, 1992
Buku Referensi
Universitas Indonesia, 1992
UI - Skripsi (Membership)
Fried, George H.
McGraw-Hill, 1995
Buku Teks
Mahmoudi, Said
Almqvist & Wiksel International, 1987
Buku Teks