Albaran, Alan B., author
Iowa University Press, 2000
Buku Teks
Tempelmans Plat, Herman, author
Butterworth-Heinemann, 2001
Buku Teks
Dempsey, Jessica, 1977, author
Wiley-Blackwell, 2016
Buku Teks
London Citibank 1995,
Buku Teks
Duff, Lois, author
Longman, 1997
Buku Teks