@thesis{thesis,
		author={arbi  anggun purnomo and Prasetyo  Yudy and Sabat  Yuliyanto},
		title ={Pronunciation Error Produced by the Third Semester Students of STKIP PGRI Sidoarjo},
		year={2019},
		url={http://repository.stkippgri-sidoarjo.ac.id/671/},
		abstract={This study investigated the types of pronunciation error and factors causing pronunciation error as seen in the video. Pronunciation error in this study referred to error in producing English diphthong. The research subjects of this study were the third semester students of STKIP PGRI Sidoarjo. This study was a descriptive qualitative study because this study aimed to describe the findings. Documentation was the technique of collecting data of this study. The researcher was the main instrument of this study. The researcher used theories of English diphthong by Gerald Kelly and Yuliyanto Sabat and theories of factors causing pronunciation error by Ladefoged. The steps of data analysis of this study were the identification, classification, and description. The results of this study showed that the researcher found 2 types of pronunciation error that were substitution and omission. The researcher also found 3 factors that caused pronunciation error. Those factors are (1) the influence of spelling English pronunciation, (2) The sound system differences between L1 and L2, (3) the inconsistency of English vowels.}
		}