Agung, Wahyu Surya, Harimukti Wandebori, dan Socrates Rudy Sirait. 2026. “Strategic Diversification and Core Competence in a Mid-Sized Construction Firm”. Jurnal Relevansi : Ekonomi, Manajemen Dan Bisnis 10 (1):39-57. https://doi.org/10.61401/relevansi.v10i1.376.