Siverson, Randolph, y Hayward R Alker. «Hayward R. Alker Jr. Et Al. Mathematical Approaches to Politics. Amsterdam : Elsevier Scientific Publishing Company, 1973. 475 P». Foro Internacional 15, no. 4 (abril 1, 1975): 638–640. Accedido abril 20, 2025. https://forointernacional.colmex.mx/index.php/fi/article/view/703.