FRED, Thompson. Some Mexican Land Snails of the Genera Coelostemma and Metastoma (Urocoptidae). Bulletin of the Florida Museum of Natural History, [S. l.], v. 15, n. 5, p. 267–302, 1971. DOI: 10.58782/flmnh.eivh8732. Disponível em: https://flmnhbulletin.com/index.php/flmnh/article/view/flmnh-vol15-no5. Acesso em: 7 may. 2026.