Hayes, Tom, author
McGraw-Hill, 2008
Buku Teks
Terranova, Tiziana, author
Pluto Press, 2005
Buku Teks
Mann, Richard, author
Gateway Books , 1998
Buku Teks
Goodfellow, Rob
KHL , 1997
Buku Teks
Knappett, Carl, author
Oxford University Press, 2014
Buku Teks