SIAHAAN, S. D. N.; AURORA ELISE PUTRIKU; SARAGIH, L. S. Validity, Practicality, and Effectiveness of Business Introduction Book Based on Theory and Practice . East Asian Journal of Multidisciplinary Research , [S. l.], v. 1, n. 10, p. 2277–2290, 2022. DOI: 10.55927/eajmr.v1i10.1234. Disponível em: https://journal.formosapublisher.org/index.php/eajmr/article/view/1234. Acesso em: 18 apr. 2026.