Aves de Europa - Identificación de todas las especies y plumajes - Lynx Nature Books
Handboek Europese Vogels: Alle Kenmerken in Beeld [Handbook of European Birds: All Characteristics in Pictures] (2-Volume Set) | NHBS Field Guides & Natural History
Hayman's Zakgids Vogels - Veldshop.nl
Weidevogel hi-res stock photography and images - Alamy
Heft en hi-res stock photography and images - Alamy
The Wryneck: Impressive new Dutch photo-ID handbook set to be published in UK later this year
Aves de Europa - Identificación de todas las especies y plumajes - Lynx Nature Books
Zilverplevier | Vogelbescherming
Identification and ageing of Glaucous-winged Gull and hybrids G