Markey, Ray
New South Wales University Press, 1988
Buku Teks
Parker, R.S.
Prentice Hall International, 1978
Buku Teks
Winda Fitri Subekti, author
Fakultas Ilmu Pengetahuan dan Budaya Universitas Indonesia, 1999
UI - Skripsi (Membership)
Golde, Hilary, author
NSWU Press, 1985
Buku Teks
Carvan, John, author
Law Book Co., 1995
Buku Teks