@thesis{thesis,
		author={Priyowibowo  Heribertus},
		title ={Students`Errors in Learning the English Primary Verbs Be, Do, And Have as an Introductory Material in SMTP Pangudi Luhur Boro Yogyakarta},
		year={1999},
		url={http://repository.usd.ac.id/10918/},
		abstract={}
		}