Iwaniuk, A. N., S. L. Olson, and H. F. James. “Extraordinary Cranial Specialization in a New Genus of Extinct Duck (Aves: Anseriformes) from Kauai, Hawaiian Islands”. Zootaxa, vol. 2296, no. 1, Nov. 2009, pp. 47–67, doi:10.11646/zootaxa.2296.1.3.