"കടലുണ്ടി ആള" എന്ന താളിന്റെ പതിപ്പുകൾ തമ്മിലുള്ള വ്യത്യാസം
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File:Sandwich Tern from the Crossley ID Guide Britain and Ireland.jpg|ID composite
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==അവലംബം==
{{reflist}}
* {{cite book | last = Snow | first = David |coauthors= Perrins, Christopher M (editors)| title = The Birds of the Western Palearctic (BWP) concise edition (2 volumes) | publisher = Oxford University Press |year = 1998| location =Oxford | isbn = 0-19-854099-X }}
* Harrison, Peter (1988). ''Seabirds (2nd edition)''. Christopher Helm, London ISBN 0-7470-1410-8
* National Geographic Society (2002). ''Field Guide to the Birds of North America''. National Geographic, Washington DC. ISBN 0-7922-6877-6
* Olsen, Klaus Malling & Larsson, Hans (1995). ''Terns of Europe and North America''. Christopher Helm, London. ISBN 0-7136-4056-1
* Stienen, Eric WM (2006). Living with gulls: trading of food and predation in the Sandwich Tern ''Sterna sandvicencis''. PhD Thesis University Groningen. [http://dissertations.ub.rug.nl/FILES/faculties/science/2006/e.w.m.stienen/DissertatieE.W.M.Stienen.pdf]
== പുറത്തേക്കുള്ള കണ്ണികൾ ==
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