Nielsen, Jakob, author
New Riders Publishing, 1999
Buku Teks
Norlin, Elaina, author
[American Library association, ], 2002
eBooks
Barnum, Carol M., author
Elesevier, 2011
Buku Teks
Williams, Robin, author
Peachpit Press, 2000
Buku Teks
Harper, Simon, author
Springer, 2008
Buku Teks