Boitani, L., Phillips, M. & Jhala, Y. 2018. Canis lupus (errata version published in 2020). The IUCN Red List of Threatened Species 2018: e.T3746A163508960. doi:10.2305/IUCN.UK.2018-2.RLTS.T3746A163508960.en. Downloaded on 10 April 2020.
Sardella, Raffaele; Bertè, Davide; Iurino, Dawid Adam; Cherin, Marco; Tagliacozzo, Antonio (2014). “The wolf from Grotta Romanelli (Apulia, Italy) and its implications in the evolutionary history of Canis lupus in the Late Pleistocene of Southern Italy”. Quaternary International328–329: 179–195. Bibcode: 2014QuInt.328..179S. doi:10.1016/j.quaint.2013.11.016.
Sardella, Raffaele; Bertè, Davide; Iurino, Dawid Adam; Cherin, Marco; Tagliacozzo, Antonio (2014). “The wolf from Grotta Romanelli (Apulia, Italy) and its implications in the evolutionary history of Canis lupus in the Late Pleistocene of Southern Italy”. Quaternary International328–329: 179–195. Bibcode: 2014QuInt.328..179S. doi:10.1016/j.quaint.2013.11.016.
“Canis lupus hodophilax, Japanese wolf”. Natural History Museum Picture Library. The Trustees of the Natural History Museum, London. 2016年3月5日時点のオリジナルよりアーカイブ。2019年5月6日閲覧。
“Canis lupus hodophilax, Japanese wolf”. Natural History Museum Picture Library. The Trustees of the Natural History Museum, London. 2016年3月5日時点のオリジナルよりアーカイブ。2019年5月6日閲覧。
