@thesis{thesis,
		author={SIKUMBANG  SUCI RAMADANI},
		title ={IMPROVING STUDENTS’ ABILITY IN LEARNING PRESENT PERFECT TENSE THROUGH MIX-FREEZE GROUP STRATEGY AT SECOND GRADE OF SMP KARYA BUNDA PERCUT SEI TUAN IN THE ACADEMIC YEAR OF 2017/2018},
		year={2019},
		url={http://repository.uinsu.ac.id/6574/},
		abstract={}
		}