?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.aufirst=Yoppy+Wahyu&rft.au=Purnomo%2C+Yoppy+Wahyu&rft.aulast=Purnomo&rft.issue=8&rft.atitle=Assessing+number+sense+performance+of+Indonesian+elementary+school+students&rft.volume=7&rft.pages=74-84&rft.title=International+Education+Studies&rft.date=2014&rft.genre=article