Sigalingging, R. I. K., H. Himayatillah, and M. Marjohan. “The Role of Financial Analysis in Diversifying Investment Portfolios”. Indonesian Development of Economics and Administration Journal, Vol. 3, no. 3, Apr. 2025, pp. 251 -57, http://ojs.ideanusa.com/index.php/idea/article/view/318.