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"Invasive Species." National Wildlife Federation. National Wildlife Federation, n.d. Web. 17 Sept. 2014. <http://www.nwf.org/Wildlife/Threats-to-Wildlife/Invasive-Species.aspx>.
"Mute Swan." BioKIDS: Kids Inquiry of Diverse Species. The University of Michigan, n.d. Web. 21 Sept. 2014. <http://www.biokids.umich.edu/critters/Cygnus_olor/>.
"Swan Control | ADC Forum | Trapperman.com Forums." Swan Control | ADC Forum | Trapperman.com Forums. N.p., n.d. Web. 21 Sept. 2014. <http://www.trapperman.com/forum/ubbthreads.php/topics/3834949/Swan_control>.
"Effects on Ecosystem." The Mute Swan Invasion. Web. 22 Sept. 2014.
"Fairford Swan Aid." Fairford Swan Aid. Web. 22 Sept. 2014.
"Hopkinsia Plana (sea Slug)." The National System for the Prevention and Management of Marine Pest Incursions. Commonwealth of Australia, n.d. Web. <http%3A%2F%2Fdata.daff.gov.au%2Fmarinepests%2Findex.cfm%3Ffa%3Dmain.spDetailsDB%26sp%3D6000008393>.
"Mute Swan: Cygnus Olor." Mute Swan. Oiseaux-Birds, n.d. Web. 22 Sept. 2014. <http://www.oiseaux-birds.com/card-mute-swan.html>.
Walsh, Meredith. "Mute Swans (Cygnus Olor)." Mute Swans (Cygnus Olor). Columbia, n.d. Web. 22 Sept. 2014.
"Mute Swan." BirdWeb. Seattle Audubon Society, n.d. Web. 22 Sept. 2014. <http://www.birdweb.org/birdweb/bird/mute_swan>.
"Swans." Swans. N.p., n.d. Web. 22 Sept. 2014. < http://www.portal.state.pa.us/portal/server.pt?open=514&objID=623106&mode=2.>
"Abiotic Factor." Abiotic Factor. N.p., n.d. Web. 22 Sept. 2014. <http://www.eoearth.org/view/article/149786.>
"The Maryland Mute Swan Task Force." The Maryland Mute Swan Task Force. N.p., n.d. Web. 22 Sept. 2014.