Splinter, John P.
Zondervan Publishing House, 1992
Buku Referensi
Rich, Phil
John Wiley & Sons, 2000
Buku Teks
Lee, Stuart D.
Facet, 2002
Buku Teks
Sinclair, Ian R.
Newnes Butterworth-Heinemann, 1994
Buku Teks
edited by Matt Bonass, Michael Rudd
Globe Law and Business, 2010
Buku Teks