Samuels, Joshua X.; Bredehoeft, Keila E.; Wallace, Steven C. (2018). "A new species of Gulo from the Early Pliocene Gray Fossil Site (Eastern United States); rethinking the evolution of wolverines". PeerJ. 6: e4648. doi:10.7717/peerj.4648. ISSN 2167-8359. PMC 5910791. PMID29682423.
Valenciano, Alberto; Govender, Romala (2020-06-01). "New insights into the giant mustelids (Mammalia, Carnivora, Mustelidae) from Langebaanweg fossil site (West Coast Fossil Park, South Africa, early Pliocene)". PeerJ. 8: e9221. doi:10.7717/peerj.9221. ISSN 2167-8359. PMC 7271888. PMID32547866
