La Gran Enciclopedia De Las Aves / The New Encyclopedia of BirdsChristopher M. Perrins · First published 2006Open the Tome
The Complete Encyclopedia of Birds and Bird MigrationChristopher M. Perrins · First published 2003Open the Tome
Birds of the Western Palearctic Vol. 8Christopher M. Perrins, Stanley Cramp · First published 1994Open the Tome
The Illustrated Encyclopedia of Birds; The Definitive Reference of the WorldDr. Christopher M. PERRINS · First published 1990Open the Tome
Collins new generation guide to the birds of Britain and EuropeChristopher M. Perrins · First published 1987Open the Tome
New generation guide to the birds of Britain and EuropeChristopher M. Perrins · First published 1987Open the Tome
The Encyclopedia of birdsChristopher M. Perrins, Alex L. A. Middleton · First published 1985Open the Tome
