@article{GockelKerrSeoketal.2014, author = {Christine Gockel and Norbert L. Kerr and Dong-Heon Seok and David W. Harris}, title = {Indispensability and group identification as sources of task motivation}, journal = {Journal of Experimental Social Psychology}, volume = {44}, number = {5}, pages = {1316 -- 1321}, year = {2014}, }