xBookUtils.terms['fn_12_1'] = "U.S. Census Bureau, Statistical Abstract of the United States, 2012 (Washington D.C.: U.S. Government Printing Office), 2012.";
xBookUtils.terms['fn_12_2'] = "G. Psacharopoulos and H. Patrinos, “Returns to Investment in Education: A Further Update,” Education Economics, 2004.";