Raworth, Philip
Thomson Professional Publishing, 1991
Buku Teks
Willes, John H.
McGraw-Hill, 2005
Buku Teks
edited and compiled by Mark Halloran
Prentice-Hall, 1991
Buku Teks
Jasion, Jan T.
Ashgate Publishing Limited, 1991
Buku Referensi
edited by Walter Sterling Surrey and Crawford Shaw
American Law Institute, 1963
Buku Teks