La Gran Enciclopedia De Las Aves / The New Encyclopedia of BirdsChristopher M. Perrins · First published 2006Open the Tome
The Illustrated Encyclopedia of BirdsChristopher Perrins · First published 1990 · Latest edition 1996Open the Tome
Handbook of the birds of Europe, the Middle East and North AfricaStanley Cramp, Christopher Perrins · First published 1993Open the Tome
Collins new generation guide to the birds of Britain and EuropeChristopher Perrins · First published 1987Open the Tome
New generation guide to the birds of Britain and EuropeChristopher M. Perrins · First published 1987Open the Tome
Pareys Naturführer Plus, Vögel. Biologie Bestimmen ÖkologieChristopher Perrins · First published 1987Open the Tome
The Encyclopaedia of birdsChristopher Perrins, Alex L. A. Middleton · First published 1985Open the Tome
