| Citation | Heide-Jorgensen, M.P. 2009 Narwhal Monodon monoceros. pp. 754-758. In Perrin, W.F.; Wursig, B.; Thewissen, J.G.M., Encyclopedia of Marine Mammals, Second Edition. Academic Press: London, 1316 p. |
| DOI / ISBN | |
| Paper URL | |
| Ref. No. | 96328 |
| Language | English |
| Usage | used in part |
| Remarks | |
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