Erard Christian. Sibley, D. — Field guide to the birds of eastern North America. Christopher Helm, A & C Black Publishers, London. 2003. In: Revue d'Écologie (La Terre et La Vie), tome 58, n°4, 2003. p. 458
Erard Chr. Borrow, N. & Demey, R. — Birds of western Africa. Helm Identification Guides. Christopher...
Bourlière François. Hollom P.-A.-D. — The popular handbook of British birds. London Witherby, 1952. ...
Erard Christian. Grimmett, R. & Inskipp, T. — Birds of Southern India. Helm Field Guides. Christophe...
Erard Christian. Robson, C. — A field guide to the birds of South-East Asia. New Holland Publishers ...
Erard Christian. Jones, H. L. — Birds of Belize. Helm Field Guides. Christopher Helm, A & C Black Pu...
Erard Christian. Del Hoyo, J., Elliott, A. & Christie, D. (eds). — Handbook of the birds of the worl...
Bourlière François. Peterson, R.T. ; Mountfort, G. ; Hollom, F.A.D.. — A field-guide to the Birds of...
Bourlière François. A Field Guide to Bird Songs of Eastern and Central North America, arranged to ac...
Erard Christian. Jeyarajasingam, A & Pearson, A. — A field guide to the birds of West Malaysia and S...
Erard Christian. Borrow, N. & Demey, R. — Birds of western Africa. Helm Identification Guides. Chris...
Bourlière François. Harrison, C. — A Field Guide to the Nests, Eggs and Nestlings of European Birds,...
Erard Chr. Olsen, K. M. & Larsson, H. — Gulls of Europe, Asia and North America. Helm field guides. ...
Bourlière François. Peterson, R.T. — A Field Guide to the Birds of Texas. Boston, Houghton Mifflin C...
Bourlière François. Irby Davis, L. A Field Guide to the Birds of Mexico and Central America. Austin ...
Bourlière François. Hollom, P. A. D. — The popular handbook of rarer british birds. London, Witherby...
Erard Chr. Borrow, N. & Demey, R. — Birds of western Africa. Helm Identification Guides. Christopher...
Bourlière François. Hollom P.-A.-D. — The popular handbook of British birds. London Witherby, 1952. ...
Erard Christian. Grimmett, R. & Inskipp, T. — Birds of Southern India. Helm Field Guides. Christophe...
Erard Christian. Robson, C. — A field guide to the birds of South-East Asia. New Holland Publishers ...
Erard Christian. Jones, H. L. — Birds of Belize. Helm Field Guides. Christopher Helm, A & C Black Pu...
Erard Christian. Del Hoyo, J., Elliott, A. & Christie, D. (eds). — Handbook of the birds of the worl...
Bourlière François. Peterson, R.T. ; Mountfort, G. ; Hollom, F.A.D.. — A field-guide to the Birds of...
Bourlière François. A Field Guide to Bird Songs of Eastern and Central North America, arranged to ac...
Erard Christian. Jeyarajasingam, A & Pearson, A. — A field guide to the birds of West Malaysia and S...
Erard Christian. Borrow, N. & Demey, R. — Birds of western Africa. Helm Identification Guides. Chris...
Bourlière François. Harrison, C. — A Field Guide to the Nests, Eggs and Nestlings of European Birds,...
Erard Chr. Olsen, K. M. & Larsson, H. — Gulls of Europe, Asia and North America. Helm field guides. ...
Bourlière François. Peterson, R.T. — A Field Guide to the Birds of Texas. Boston, Houghton Mifflin C...
Bourlière François. Irby Davis, L. A Field Guide to the Birds of Mexico and Central America. Austin ...
Bourlière François. Hollom, P. A. D. — The popular handbook of rarer british birds. London, Witherby...
Erard Chr. Borrow, N. & Demey, R. — Birds of western Africa. Helm Identification Guides. Christopher...
Bourlière François. Hollom P.-A.-D. — The popular handbook of British birds. London Witherby, 1952. ...
Erard Christian. Grimmett, R. & Inskipp, T. — Birds of Southern India. Helm Field Guides. Christophe...