Manning, Christopher D.
Cambridge University Press, 2008
Buku Teks
Doyle, Lauren B.
John Wiley & Sons, 1975
Buku Teks
Wolfram, Dietmar
Libraries Unlimited, 2003
Buku Teks
Ellis, David
Library Association Publishing, 1996
Buku Teks
Baeza-Yates, Ricardo
Addison-Wesley , 1999
Buku Teks