Linnaeus, C. (1758). Systema Naturae per regna tria naturae, secundum classes, ordines, genera, species, cum characteribus, differentiis, synonymis, locis. <em>Editio decima, reformata. Laurentius Salvius: Holmiae.</em> ii, 824 pp., available online athttp://www.biodiversitylibrary.org/item/10277#page/3/mode/1up[details] Available for editors
ERMS (2018). Ursus Linnaeus, 1758. Accessed at: http://www.marbef.org/data../aphia.php?p=taxdetails&id=137011 on 2019-02-22
Costello, M.J.; Bouchet, P.; Boxshall, G.; Arvanitidis, C.; Appeltans, W. (2019). European Register of Marine Species. Ursus Linnaeus, 1758. Accessed at: http://www.marbef.org/data/aphia.php?p=taxdetails&id=137011 on 2019-02-22
original descriptionLinnaeus, C. (1758). Systema Naturae per regna tria naturae, secundum classes, ordines, genera, species, cum characteribus, differentiis, synonymis, locis. <em>Editio decima, reformata. Laurentius Salvius: Holmiae.</em> ii, 824 pp., available online athttp://www.biodiversitylibrary.org/item/10277#page/3/mode/1up[details] Available for editors
basis of recordWilson D.E. & Reeder D.A.M. (1993). Mammals species of the world. A taxonomic and geographic reference. Second edition. Smithsonian Institution Press, Washington, 1206 pp.[details]
additional sourcevan der Land, J. (2001). Tetrapoda, <B><I>in</I></B>: Costello, M.J. <i>et al.</i> (Ed.) (2001). <i>European register of marine species: a check-list of the marine species in Europe and a bibliography of guides to their identification. Collection Patrimoines Naturels,</i> 50: pp. 375-376 (look up in RoR) [details]