Keeton, Robert E., author
West Publishing, 1988
Buku Teks
Widiss, Alan I
West Publishing, 1989
Buku Teks
Keeton, Robert E., author
West Pub. Co., 1960
Buku Teks
Dobbyn, John F., author
West Publishing, 1989
Buku Teks
Dobbyn, John F., author
West Publishing, 1996
Buku Teks