Manoj, Jyothi, and Suresh K K. “Forecast Model for Price of Gold: Multiple Linear Regression With Principal Component Analysis”. Thailand Statistician 17, no. 1 (December 27, 2018): 125–131. Accessed April 29, 2024. https://ph02.tci-thaijo.org/index.php/thaistat/article/view/163230.