4Bracke, M. S. et al. Finding information in a new landscape: de-veloping new service and staffing models for mediated information services[J]. College & Research Libraries. 2007,68 ( 3 ) : 248 - 267.
6Matthew P. Long, Roger C. Schonfeld. Ithaka S + R library survey 2010 : Insights from U. S. academic library directors[ EB/OL]. ht- tp ://www. sr. ithaka, org/research - publications/ithaka - sr - us - library - survey - 2013. [ 2015 - 04 - 18 ].
7Purcell K. Search and email still top the list of most popular online activities [ J ]. Pew Internet & American Life Project, 2011 (9) :1 -15.
8Hodges, D. ; Preston,C. ; Hamilton M.J. Patron- initiated collection development: Progress of a paradigm shift[ J ]. Collection Management ,2010 ( 35 ) :208 - 221.
9Fischer K S, Wright M, Clatanoff K, et al. Give Em what they want : A one - year study of unmediated patron - driven ac - quisition of e- books[ J]. College & Research Libraries, 2012, 73(5) :469 -492.
10Fischer K S, Diaz C. Four years of unmediated demand - driven acquisition and 5,000 e - books later: We gave' em what they wanted [ EB/OL]. http://dx, doi. org/10. 5703/1288284315296. [2015 -03 -061.