ASTUTI, A. M. Fixed Effect Model Pada Regresi Data Panel. Beta: Jurnal Tadris Matematika, [S. l.], v. 3, n. 2, p. 134–145, 2010. Disponível em: https://jurnalbeta.ac.id/index.php/betaJTM/article/view/91. Acesso em: 31 aug. 2026.