4T. D. Wilson. Human Information Behavior[J]. Informing Science,2000,3(2):49-56.
5Nahl D. Learning the Internet and the structure of information behavior[J]. Journal of the American Society for Information Science, 1998,49(11) :1017- 1023.
6Li Y. Task type and a faceted classification of task[EB/OL]. [2008-08-05]. http://www, asis. org/Conferences/AM04/posters/250, doc.
7Vakkari P. Task-based information searching[J]. Annual Review of Information Science and Technotogy,2003,(37) :413-464.
8M. E. Maron.On indexing,retrieval and the meaning of about[J]. Journal of the American Society for Information Scienca,1977,28(1):38-43.
