Ellingsen, Herrmann, MA Nowak, DG Rand, and CE Tarnita. 2013. “Civic Capital in Two Cultures: The Nature of Cooperation in Romania and USA..” Reference Link
Fu, CE Tarnita*, NA Christakis, Wang, DG Rand, and MA Nowak. 2012. “Evolution of in-Group Favoritism.”. Nature Scientific Reports doi:10.1038/srep00460: *joint first authors. Reference Link