The purposes of the study were (a) to conduct the reliability and validity studies of the Approaches to Learning and Studying Inventory (ALSI-short version) and (b) to explore the relationship between epistemological beliefs, self-efficacy beliefs, learning and studying approaches and academic achievement. For the first purpose of the study, the data were collected from 537 university students attending Ege University and from 630 students for the second purpose of the study. The results of the confirmatory factor analysis demonstrated that the data supported the proposed model. The test-retest reliability coefficient was r=0.82. McDonald's omega reliability coefficient results were also at an adequate level. The findings of the path analysis showed that epistemological beliefs determine learning and studying approaches indirectly through self-efficacy beliefs and also, the belief that there is only one unchanging truth influence academic achievement through strategic learning and studying approaches.