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Hayati T, Firdaus H. EFEKTIVITAS KOMUNIKASI INTERPERSONAL DAN SELF CONCEPT TERHADAP OPTIMISME PENGUSAHA GAS ELPIJI PT. HARUPA JAYA CIAMIS. IJEN [Internet]. 2023 Sep. 25 [cited 2024 Nov. 20];1(2):84-93. Available from: https://jurnal.academiacenter.org/index.php/IJEN/article/view/62