Taxon - Odkazy a literatura
druh
užovka černá
Pantherophis obsoletus (Say, 1823)
Ratsnakes of the Genus Elaphe [Eobsoleta]
Korell S., Knight R.: Ratsnakes of the Genus Elaphe [http://www.ratsnakes.com]
Reptile Database - Search [genus=Pantherophis&species=obsoletus]
Reptile Database - Search [http://reptile-database.reptarium.cz/] [jako Pantherophis obsoletus (SAY, 1823)]
Datum citace: 20. srpen 2018
IUCN Red List of Threatened Species 2024-1 [90069553]
IUCN Red List of Threatened Species [http://www.iucnredlist.org/] [jako Pantherophis obsoletus (Say, 1823)]
Datum citace: 29. leden 2024
Zootier-Lexikon [6510:pilotnatter-elaphe-pituophis-obsoleta&Itemid=180]
Dollinger P.: Zootier-Lexikon
Datum citace: 26. květen 2019
Paleobiology Database [155170]
Paleobiology Database [https://paleobiodb.org/] [jako Elaphe obsoleta (Say, 1823)]
Datum citace: 11. prosinec 2015