Rujukan WikiPedia: Kebajikan http://www.dictionaryofeconomics.com/article?id=pd... http://www.dictionaryofeconomics.com/article?id=pd... http://www.dictionaryofeconomics.com/article?id=pd... http://www.sciencedirect.com/science?_ob=ArticleUR... http://www.sciencedirect.com/science?_ob=ArticleUR... //lccn.loc.gov/2008009151 //doi.org/10.4135%2F9781412965811.n327 http://www.econlib.org/library/Enc/Welfare.html http://sw.oxfordjournals.org/content/7/2/112.1.ext... //www.worldcat.org/oclc/237794267
