W Wasono M, Leonardus, et al. “Digital Transformation in the Age of Industry 4.0: Acceleration of Transformational Performance through Business Model Innovation and Co-Creation Strategy in Indonesia ICT Firm”. International Journal of Engineering & Technology, vol. 8, no. 1.10, Mar. 2019, pp. 250-6, https://doi.org/10.14419/ijet.v8i1.10.28401.