This is the pre-print version of an article published in College andResearch Libraries, July 2012; 73 (4). Issue URL:http://crl.acrl.org/content/73/4.toc Article URL: http://crl.acrl.org/content/73/4/379.full.pdf+html
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机译：这是2012年7月在College and Research Libraries中发表的文章的预印本； 73（4）。发行网址：http：//crl.acrl.org/content/73/4.toc文章网址：http：//crl.acrl.org/content/73/4/379.full.pdf+html
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