Zairy, Aryadi Irfan Arsitektur strategik pada ptp nusantara vi (persero) 2004 Manajemen Strategi Pt.Pn Vi(Persero) Plasma Inti Kelapa Sawit Teh Karet Good Corporate Governance Stakeholders E-Commerce Ekonomi Era Digital B2b Porter's Five Forres Model Rantai Nilai