Anh, N. T. L., Hanh, N. T. M., Anh, H. M., & Tuan, N. P. (2013). Responsibility and authority in management of overseas upstream investment and application for Petrovietnam. Petrovietnam Journal, 7, 48-5. Retrieved from http://www.tapchidaukhi.vn/index.php/TCDK/article/view/691