Saragih, J., & 		Suryadi, E.
(2015).
 Strategi Bersaing PT. Perusahaan Gas Negara (Persero) Tbk SBU Distribusi Wilayah I.
<em>Matrik : Jurnal Manajemen, Strategi Bisnis, Dan Kewirausahaan, </em>.
Retrieved from <a href="http://103.29.196.112/index.php/jmbk/article/view/14285" target="_new">http://103.29.196.112/index.php/jmbk/article/view/14285</a>