1. Agapie , E. Golovchinsky , G. Qvarfordt , P. 2013
2. A theory of the origins of human knowledge;Anderson;Artificial Intelligence,1989
3. Aula , A. Käki , M. 2003 WWW/Internet
4. Bateman , S. Teevan , J. White , R.W. 2012
5. Information search tactics;Bates;Journal of the American Society for Information Science,1979