Hadwiger, Don F.
Cal. Chandler Pub. , 1965
Buku Teks
Harman, Thomas L., author
Prentice-Hall, 1981
Buku Referensi
Devine, Tom, author
Berrett-Koehler, 2011
Buku Teks
Steingold, Attorney Fred S., author
Nolo, 2006
Buku Teks
Kintner, Earl W.
Macmillan Publishing Co.Inc., 1973
Buku Teks