?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adissertation&rft.aulast=Ratnasari&rft.au=Ratnasari%2C+Desi&rft.aufirst=Desi&rft.inst=Universitas+Negeri+padang&rft.degree=Bachelor%2FSkripsi&rft.date=2013&rft.title=Teaching+Writing+by+Using+Roll+Sentences+to+Sixth+Grade+Students+of+Elementary+School