The purpose of this study was to explore the role of feedback based on self-efficacy belief sources in the reciprocal interaction of teaching performance and self-efficacy beliefs. A single case study design was employed to address and began to bridge the gap in our understanding of the relationship between feedback, self-efficacy belief and teaching performance. The data for this study were collected in the form of semi-structured interviews from 6 volunteer 5th-grade chemistry student teachers. The data were analyzed based on an inductive analytical approach. The results indicated that different types of feedback based on self-efficacy belief sources directly affected the student teachers' self-efficacy beliefs and teaching performance. It may be concluded that different types of feedback provided key paths for student teachers to better understand their own developing teaching performance and that of other teachers.