Albertsen, John O. and Yuji Kanazawa. 2002.
Numbers and Ecology of Swans Wintering in Japan
Waterbirds. Vol 25. Special Publication No. 1. Proceedings of the Fourth International Swan Symposium. Pgs 74-85.

American Ornithologists' Union. 1998.
Check-list of North American birds: 7th edition
The American Ornithologists' Union. Allen Press, Lawrence, Kansas.
(ISBN: 1-891276-00-X)

Beaman, Mark and Steve Madge. 1998.
The Handbook of Bird Identification for Europe and the Western Palearctic
Princeton University Press. Princeton, New Jersey. 868 pgs.
(ISBN 0-691-02726-9, LC: QL690.A1B385 1998)

Bellrose, Frank C. 1976.
Ducks, Geese & Swans of North America: Second Edition
Stackpole Books. Harrisburg, Pennsylvania. 543 pgs.
(ISBN: 0-8117-0535-8)

Chisholm, Helen and Chris Spray. 2002.
Habitat Usage and Field Choice by Mute and Whooper Swans in the Tweed Valley, Scotland
Proceedings of the Fourth International Swan Symposium 2001.
Waterbirds. Volume 25. Special Publication 1. pgs 177-182.
(ISSN: 1524-4695)

Colhoun, Kendrew and Keith R. Day. 2002.
Effects of Grazing on Grasslands by Wintering Whooper Swans
Waterbirds. Vol 25. Special Publication No. 1. Proceedings of the Fourth International Swan Symposium. Pgs 168-176.

Dickinson, Edward C. (Editor). 2003.
The Howard & Moore Complete Checklist of the Birds of the World. Third Edition.
Princeton University Press, Princeton, New Jersey. 1039 pgs. (ISBN: 0-691-11701-2)

Johnsgard, Paul A. 1965.
Handbook of Waterfowl Behavior
Comstock Publishing Associates. Cornell University Press. Ithaca, New York. 378 pgs.

Johnsgard, Paul A. 1978.
Ducks, Geese, and Swans of the World
University of Nebraska Press. Lincoln and London. 404 pgs.
(ISBN 8-8032-0953-3)

Kallander, Hans. 2005.
Commensal Association of Waterfowl with Feeding Swans
Waterbirds. Vol 28. No 3. pgs 326-330.

Madge, Steve and Hilary Burn. 1988.
Waterfowl: an identification guide to the ducks, geese, and swans of the world.
Houghton Mifflin Company. Boston, Massachusetts. 298 pgs.
(ISBN: 0-395-46727-6)

Nilsson, Leif. 2002.
Numbers of Mute Swans and Whooper Swans in Sweeden, 1967-2000
Proceedings of the Fourth International Swan Symposium 2001.
Waterbirds. Volume 25. Special Publication 1. pgs 53-60.
(ISSN: 1524-4695)

Palmer, Ralph S. 1976.
Handbook of North American Birds: Waterfowl
Yale University Press. New Haven and London. Vol 2. 521 pgs.
(ISBN 0-300-01902-5)

Pennycuick, C.J., T.A.M. Bradbury, Ólafur Einarsson, and Myrfyn Owen. 1999.
Response to weather and light conditions of migrating Whooper Swans Cygnus cygnus and flying height profiles, observed with the Argos satellite system
IBIS Vol 141, No 3. July. pgs 434-443. (ISSN 0019-1019)

Pennycuick, C.J., Ólafur Einarsson, T. A. M. Bradbury, and Myrfyn Owen. 1996.
Migrating Whooper Swans Cygnus cygnus: satellite tracks and flight performance calculations
Journal of Avian Biology. Vol 27. No 2. pgs 118-134.