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Morony, John J.; Bock, Walter Joseph; Farrand, John (1975). Reference list of the birds of the world. New York: American Museum of Natural History. hdl:2246/6700. OCLC483451163.
Greenwood, J. J.; Gregory, R. D.; Harris, S.; Morris, P. A.; Yalden, D. W. (1996). "Relations between abundance, body size and species number in British birds and mammals". Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences. 351 (1337): 265–278. Bibcode:1996RSPTB.351..265G. doi:10.1098/rstb.1996.0023.
Squires, J. R.; Anderson, S. H. (1997). "Changes in trumpeter swan (Cygnus buccinator) activities from winter to spring in the greater Yellowstone area". American Midland Naturalist. 138 (1): 208–214. doi:10.2307/2426667. JSTOR2426667. S2CID88186703.
Rohwer, F. C.; Eisenhauer, D. I. (1989). "Egg mass and clutch size relationships in geese, eiders, and swans". Ornis Scandinavica. 20 (1): 43–48. doi:10.2307/3676706. JSTOR3676706.
Squires, J. R.; Anderson, S. H. (1997). "Changes in trumpeter swan (Cygnus buccinator) activities from winter to spring in the greater Yellowstone area". American Midland Naturalist. 138 (1): 208–214. doi:10.2307/2426667. JSTOR2426667. S2CID88186703.
Morony, John J.; Bock, Walter Joseph; Farrand, John (1975). Reference list of the birds of the world. New York: American Museum of Natural History. hdl:2246/6700. OCLC483451163.