Ardian Sopa, Masduki Asbari, Agus Purwanto, Priyono Budi Santoso, Mustofa, Dhaniel Hutagalung, Siti Maesaroh, Mohamad Ramdan, Riza Primahendra. “Hard Skills Versus Soft Skills: Which Are More Important for Indonesian Employees Innovation Capability”. International Journal of Control and Automation, Vol. 13, no. 02, Apr. 2020, pp. 156 -75, http://sersc.org/journals/index.php/IJCA/article/view/7626.