The purpose of this study was to investigate a predictive power of prospective teachers' self-efficacy sources on their teaching self-efficacy and attitude towards the teaching profession. Design of the study was the correlational research. The study was conducted on 315 prospective teachers studying pedagogical formation education in a 2017-18 academic year. Instruments were "Prospective Teachers' Self-Efficacy Sources Scale", "Teaching Self-Efficacy Scale" and "Attitude Scale of Teaching Profession". Pearson Product Moment Correlation Coefficient and PATH analysis methods were used to analyze the data. Results indicated that emotional states, mastery experience, and verbal persuasion were significant predictors of prospective teachers' teaching self-efficacy and attitudes towards teaching profession.