Shandy, D. N., W. Widayati, and M. Zainnuddin. “The Improvement of Social Science Learning Outcomes about Cooperative through Two Stay Two Stray Model on Students in Class IV, SDN I Karanganom, Tulungagung”. Journal of Social Sciences (COES&Amp;RJ-JSS), vol. 6, no. 3, Oct. 2017, pp. 481-90, doi:10.25255/jss.2017.6.3.481.490.