Poerba, Fransisko Gemanta, Christina Ayuningtyas, and Irham A. Dilmy. 2008. “MANAJEMEN STRATEJIK PADA PERUSAHAAN GITA GROUP”. Journal of Business Strategy and Execution 1 (1):106 -20. https://journal.binus.ac.id/index.php/JBSE/article/view/175.