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Handbook of Bird Biology. New York, NY: John Wiley and Sons. p. 13. ISBN 978-1-118-29104-7. Boertmann, D. (1990). "Phylogeny of the divers, family Gaviidae (Aves)"...

Fitzpatrick, John W. (2016). Handbook of Bird Biology. Wiley. ISBN 978-1-118-29104-7. Newton, Alfred; Gadow, Hans Friedrich; Lydekker, Richard; Roy, Charles...