Cohen, Morris L.
West Publishing , 1978
Buku Teks
Cohen, Morris L.
St. Paul Minn, 1992
Buku Teks
Cohen, Morris L.
RajaGrafindo Persada, 1995
Buku Referensi
Sinha, Surya Prakash
West Pub. Co., 1993
Buku Teks
Haggard, Thomas R.
West Publishing, 1996
Buku Teks