Schulze Walgern, Anna, and Marcus Mergenthaler. “Pig Farming from the Perspective of German Citizens – Comments on Videos of a Pig Fattening Pen”. German Journal of Agricultural Economics 69, no. 4 (November 30, 2020). Accessed May 21, 2025. https://www.tib-op.org/ojs/index.php/gjae/article/view/2187.