HAYATI, T.; FIRDAUS, H. . EFEKTIVITAS KOMUNIKASI INTERPERSONAL DAN SELF CONCEPT TERHADAP OPTIMISME PENGUSAHA GAS ELPIJI PT. HARUPA JAYA CIAMIS. Indonesian Journal of Economy and Education Economy , [S. l.], v. 1, n. 2, p. 84–93, 2023. DOI: 10.61214/ijen.v1i2.62. Disponível em: https://jurnal.academiacenter.org/index.php/IJEN/article/view/62. Acesso em: 20 nov. 2024.