BTO British Trust for Ornithology CRBPO France East Dales Ringing Group G.N. Habitat G.O.ES., Grupo Ornitológico del Estrecho GCA Grup Catalá d´Anellament GIA-ASTURIAS GIA-LEÓN GOB Balears Huddleston & Jackson Bird Ringing Partnetship North West Norfolk Ringing Group Wash Wader Ringing Group Dartford Ringing Group Ringing in northern Sweden Rye Meads Ringing Group SCA Societat Catalana d'Anellament Txepetxa. Asociación para el anillamiento científico de aves Akerøya Bird Observatory Australian Bird and Bat Banding Scheme Belgium Ringing Center (Belgium) Biological Station Rybachy Bird Ringing Center (Sweden) BTO, Bird Ringing Center (United Kingdom) Castricum Bird Ringing Station Centro de Migración de Aves (SEO/BirdLife) Copenhagen Bird Ringing Center (Denmark) C.R.B.P.O. (France) Estación Biológica de Doñana Euring Data Bank Fair Isle Bird Observatory Falsterbo Finnish Museum of Natural History - Ringing Scheme Finnish Ringing Center (Finland) Hiddensee Bird Ringing Center (Germany) Landguard Bird Observatory Landsort Bird Observatory North Ronaldsay Bird Observatory Observatorio Ornitológico Annsjon (Sweden) Ornithological Station (IoE) (Poland) Sandwich Bay Bird Observatory Trust Schweizerische Vogelwarte  Strait of Gibraltar Bird Observatory South African Bird Ringing Unit. SPEA (Sociedade Portugesa para o estudo das aves) The Jerusalem Bird Observatory Turöy Valletta Bird Ringing Schemme Vogelringstation nebularia Vogelwarte Helgoland (Germany) Vogelwarte Radolfzell (Germany)   Aguila Pescadora (seguimiento por satélite) Cigüeña Negra (seguimiento por satélite) Colour Ring Birding (CR-Birding)   RINGING AND MIGRATION JOURNAL OF FIELD ORNITHOLOGY ARDEOLA AIRO REVISTA CATALANA D'ORNITOLOGIA   Birdpages - Piteå, Sweden European Ringing and Migration Studies Atlas de identificación de las aves de Aragón Manual del Anillador