Manchester, Colin, author
Routledge.Cavendish, Taylor & Francis Group, 2008
Buku Teks
Epstein, Adam, author
Pearson/Prentice Hall, 2006
Buku Teks
Mark S. Lee, authror
Thomson, 2006
Buku Teks
Fine, Frank L, author
Sweet & Maxwell, 2006
Buku Teks
Kintner, Earl W., author
Macmillan, 1975
Buku Teks