McKillup, Steve, author
Cambridge University Press, 2011
Buku Teks
Farrell, Joyce, author
Course Technology Cengage Learning, 2013
Buku Teks
Jarvis, Tracey J., author
John Wiley & Sons, 1995
Buku Teks
Head, Alison J., author
Information Today, 2000
Buku Teks
Johnson, Jeff, author
Elsevier, 2010
Buku Teks