Ding, Yongcong, and Murty K.S. Madugula. “Elastic and Plastic Section Moduli of Steel Angles About Principal Axes”. Engineering Journal 41, no. 1 (March 31, 2004): 7–14. Accessed February 12, 2025. https://ej.aisc.org/index.php/engj/article/view/823.