Daud, A., A. Suharyanto, P. Diawati, P. T. Nguyen, and K. Shankarn. “A Quantitative Analysis of Portfolio Governance Management for Product Innovation in Organization Management Systems”. Religación, Vol. 4, no. 19, Sept. 2019, pp. 262-7, https://revista.religacion.com/index.php/religacion/article/view/753.