Bradley C. Livezey & Robert W. Storer: Morphometric Comparison of Skeletons of the Western Grebe Complex Aechmophorus of the United States and Canada. Condor, 94, 3, S. 668–679, 1992 doi:10.2307/1369251PDF
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Bradley C. Livezey & Robert W. Storer: Morphometric Comparison of Skeletons of the Western Grebe Complex Aechmophorus of the United States and Canada. Condor, 94, 3, S. 668–679, 1992 doi:10.2307/1369251PDF
Gary L. Nuechterlein & Deborah P. Buitron: Diving Differences between Western and Clark's Grebes. Auk, 106, 3 S. 467–470, 1989 PDF