Mimi Recker Sarah Giersch Andrew Walker Sam Halioris Xin Mao Bart Palmer A study of <i>how</i> online learning resource are used. 179-180 2007 conf/jcdl/2007 JCDL http://doi.acm.org/10.1145/1255175.1255209 db/conf/jcdl/jcdl2007.html#ReckerGWHMP07