Jurnal Utama:
Nweeia, M.T., F.C. Eichmiller, P.V. Hauschka, G.A. Donahue, J.R. Orr, S.H. Ferguson, C.A. Watt, J.G Mead, C.W. Potter, R. Dietz, A.A. Giuseppetti, S.R.Black, A.J. Trachtenberg & W.P. Kuo. 2014. Sensory ability in the narwhal tooth organ system. The Anatomical Record 297: 599—617.
Referensi:
Facts Animal. 2019. Narwhals fact. 1 hlmhttps://factanimal.com/narwhals/ diakses pada 14 Desember 2019 pk. 22.15 WIB
IUCN. 2019. Narwhals: Monodon Monoceros. 1 hlm. https://www.iucnredlist.org/species/13704/50367651 diakses pada 14 Desember 2019 pk. 22.35 WIB
National Geographic. 2019. Explorer of the week: Martin Nweeia. 1 hlm. https://blog.nationalgeographic.org/2012/09/26/explorer-of-the-week-martin-nweeia/ diakses pada 9 Desember pk. 15.15 WIB
Republik Eusosialis Tawon. 2013. Narwhal, unicorn dari laut. 1 hlm. https://www.re-tawon.com/2013/12/narwhal-unicorn-dari-laut.html/ diakses pada 9 Desember 2019 pk. 15.00 WIB
The Spectator. 2019. What exactly is a narwhal?. 1 hlm. https://www.spectator.co.uk/2019/12/what-exactly-is-a-narwhal/ diakses pada 14 Desember 2019 pk. 16.55 WIB
WWF. 2019. Unicorn of the sea: Narwhal Facts. 1 hlm. https://www.worldwildlife.org/stories/unicorn-of-the-sea-narwhal-facts/ diakses pada 14 Desember 2019 pk. 22.15 WIB.
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