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Reference Guide to Gulls of the Americas. The Peterson Reference Guide Series. New York: Houghton Mifflin. pp. 64–66, 316–318. ISBN 978-0-618-72641-7....

America. Boston, Massachusetts, US: Houghton Mifflin. p. 13. ISBN 978-0-618-72641-7. Dunning, John B. Jr. (2008). CRC Handbook of Avian Body Masses. Boca...

J (2007). Gulls of the Americas. Houghton Mifflin Harcourt. ISBN 978-0-618-72641-7. Look up gull in Wiktionary, the free dictionary. Wikimedia Commons...

Gulls of the Americas. New York, NY: Houghton Mifflin Company. ISBN 978-0-618-72641-7. King, Anthony Stuart; McLelland, John, eds. (1985). Form and Function...

Gulls of the Americas. New York: Houghton Mifflin Company. ISBN 978-0-618-72641-7. King, Anthony Stuart; McLelland, John, eds. (1985). Form and Function...