Head, Alison J., author
Information Today, 2000
Buku Teks
Johnson, Jeff, author
Elsevier, 2010
Buku Teks
edited by Alistair D.N. Edwards, Simon Holland
Springer-Verlag, 1992
Buku Teks
Cox, Kevin, author
Prentice-Hall, 1993
Buku Teks
Thimbleby, Harold, author
ACM Press, 1990
Buku Teks