Ratzan, Lee
American Library Association, 2004
eBooks
Duhigg, Charles
Heinemann, 2012
Buku Teks
Gorton, Gary B.
Oxford University Press, 2012
Buku Teks
Jurnal Teknologi, 15 (2) Juni 2001 : 134-146 , 2001
Artikel Jurnal
Fournies, Ferdinand
McGraw-Hill, 2003
Buku Teks