Ortolano, Leonard
John Wiley & Sons, 1997
Buku Teks
Ortolano, Leonard
John Wiley & Sons, 1996
Buku Teks
Giuliano Amato, Laraine Laudati, editor
Edward Elgar , 2001
Buku Teks
Little,Brown and Company, [date of publication not identified]
Buku Teks
Canter, Larry W., author
McGraw-Hill, 1977
Buku Teks