Çankaya, Soner, Samet Eker, and Samet Hasan Abacı. 2019. “Comparison of Least Squares, Ridge Regression and Principal Component Approaches in the Presence of Multicollinearity in Regression Analysis”. Turkish Journal of Agriculture - Food Science and Technology 7 (8):1166-72. https://doi.org/10.24925/turjaf.v7i8.1166-1172.2515.