author = { Karlan, Dean National Bureau of Economic Research McConnell, Margaret A. },

title = { Hey Look at Me The Effect of Giving Circles on Giving },

publisher = {National Bureau of Economic Research},

year = {January 2012},

booktitle = {NBER working paper series ; no. w17737},

address = { Cambridge, Mass },

url = { http://slubdd.de/katalog?TN_libero_mab2 }