Alberto L. Cione, Eduardo P. Tonni, Leopoldo Soibelzon: The Broken Zig-Zag: Late Cenozoic large mammal and tortoise extinction in South America. In: Revista del Museo Argentino de Ciencias Naturales. 5, 1, 2003, ISSN1514-5158, S. 1–19, online (PDF; 243 KB)Arhivirano 2011-07-06 na Wayback Machine-u
Alberto L. Cione, Eduardo P. Tonni, Leopoldo Soibelzon: The Broken Zig-Zag: Late Cenozoic large mammal and tortoise extinction in South America. In: Revista del Museo Argentino de Ciencias Naturales. 5, 1, 2003, ISSN1514-5158, S. 1–19, online (PDF; 243 KB)Arhivirano 2011-07-06 na Wayback Machine-u
worldcat.org
Alberto L. Cione, Eduardo P. Tonni, Leopoldo Soibelzon: The Broken Zig-Zag: Late Cenozoic large mammal and tortoise extinction in South America. In: Revista del Museo Argentino de Ciencias Naturales. 5, 1, 2003, ISSN1514-5158, S. 1–19, online (PDF; 243 KB)Arhivirano 2011-07-06 na Wayback Machine-u