Bird, Roger
Sweet & Maxwell, 1983
Buku Teks
Oran, Daniel
West Publishing Co., 1975
Buku Teks
Bryan A. Garner, author
Thomson West, 2007
Buku Teks
Fox, James R., author
Oceana Publications, Inc, 1992
Buku Teks
Black, Henry Campbell, author
West Publishing, 1968
Buku Referensi