Kim, Yong Seog, and Clay Moffitt. “Estimating the Direction and Magnitude of Substitution Effects in MLB Event Attendance”. International Journal of Engineering and Management Research 16, no. 1 (February 6, 2026): 84–94. Accessed March 17, 2026. https://ijemr.vandanapublications.com/index.php/j/article/view/1840.