(en) Sir John Richardson et John Edward Gray, The zoology of the voyage of H.M.S. Erebus and Terror, under the command of Capt. Sir J. C. Ross during 1839-1843, vol. 1, Londres, E. W. Janson, 1844-1875, 324 p. (lire en ligne), p. 39 du paragraphe Birds (118e page)