@article{M. Hum_Gultom_2018, title={Increasing Students’ Understanding of the Simple Past Tense Using Discovery Learning at VII grade students of SMP Negeri 4 Doloksanggul in Academic Year 2017/218}, volume={3}, url={http://dx.doi.org/10.22161/ijels.3.5.25}, DOI={10.22161/ijels.3.5.25}, number={5}, journal={International Journal of English Literature and Social Sciences}, publisher={AI Publications}, author={M. Hum, Holmes Rajagukguk and Gultom, Dia Sinta}, year={2018}, pages={839–842} }