Lunney, glynn, author
West, 2010
Buku Teks
David W Robertson ... [et al.]
Thomson/West, 2011
Buku Teks
Todd, Paul, author
London : Balckstone, 1994,
Buku Referensi
Dine, Janet, author
Blackstone Press, 1998
Buku Referensi
Stone, Richard, author
Blackstone Press, 1996
Buku Referensi