Taxonomically we follow:
Gill F, D Donsker & P Rasmussen (Eds). 2021. IOC World Bird List (v11.1)

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Selected references:
Blasco-Zumeta, J & Heinze, G-M Identification Atlas of Birds of Aragon
Chandler R 2009, Shorebirds of the Northern Hemisphere, London
Chappuis, C 1987, Migrateurs et hivernants
Cofta, T 2021, Flight Identification of European Passerines and selected Landbirds, New Jersey
Couzens, D & Nurney, D 2013, Bird ID Insights, digital edition, London
del Hoyo, J et. al Handbook of the Birds of the World alive, Barcelona
Dutch Birding
Forsman, D 2016, Flight Identification of Raptors of Europe, North Africa
and the Middle East, digital edition, London
Jännes, H 2003, Calls of eastern vagrants, Helsinki
Macaulay Library
Message, S & Taylor, D 2013, Waders of Europe, Asia and North America,
digital edition, London
Ottenby Fågelstation Ringers‘ Digi Guide
Pieplow, Nathan 2017 & 2019, Peterson Field Guide to Bird Sounds of
Eastern and Western North America, Houghton Mifflin Harcourt
Robb, M & Dutch Birding 2003, Out of the blue, Santpoort-Zuid
Shirihai H & Svensson L 2018, Handbook of Western Palearctic Birds, London
Svensson, L, Mullarney, K & Zetterström, D 2014, Collins Bird Guide,
digital edition, London
van Duivendijk, N 2011, Advanced Bird ID Handbook, The Western
Palaearctic, New Holland
Vinicombe, K, Harris, A & Tucker, L 2014, The Helm Bird Guide
to Bird Identification, digital edition, London
Xeno-Canto