Givers vs. Takers: The Surprising Truth about Who Gets Ahead
Published: April 10, 2013 in Knowledge@Wharton
http://knowledge.wharton.upenn.edu/article.cfm?articleid=3224
给予者vs.索取者：揭开自私者和无私者的惊人真相
http://www.knowledgeatwharton.com.cn/index.cfm?fa=article&articleid=2776&languageid=4