Epstein, Adam, author
Pearson/Prentice Hall, 2006
Buku Teks
Manchester, Colin, author
Routledge.Cavendish, Taylor & Francis Group, 2008
Buku Teks
Mark S. Lee, authror
Thomson, 2006
Buku Teks
Kintner, Earl W., author
Macmillan, 1975
Buku Teks
Mark Hobart, Richard Fox, editor
Routledge, 2008
Buku Teks