Premanandan Christopher, and Runcan Erin. “Canine Placentation: Normal Gross and Histologic Structure, and Confounding Features of Evaluation”. Clinical Theriogenology 11, no. 4 (December 1, 2019): 623-625. Accessed February 13, 2025. https://clinicaltheriogenology.net/index.php/CT/article/view/9463.