WIDYASTUTI, Maria. Strategi Diferensiasi: Mencapai Keunggulan Kompetitif yang Sustainable. BIP’s JURNAL BISNIS PERSPEKTIF, [S. l.], v. 3, n. 2, p. Hal 109 – 120, 2011. DOI: 10.37477/bip.v3i2.287. Disponível em: https://jurnal.ukdc.ac.id/index.php/BIP/article/view/287. Acesso em: 4 jul. 2025.