Erard Christian. Message, S. & Taylor, D. — Waders of Europe, Asia and North America. Christopher Helm, A & C Black Publishers Ltd, London. 2005. In: Revue d'Écologie (La Terre et La Vie), tome 61, n°2, 2006. pp. 206-207
Erard Christian. Lever, C. — Naturalised birds of the world. T & AD Poyser, A & C Black Publishers, ...
Erard Christian. Robson, C. — A field guide to the birds of South-East Asia. New Holland Publishers ...
Erard Christian. König, C. & Weickck, F. — Owls of the world. Christopher Helm, A& C Black Publisher...
Erard Christian. Latta, S., Rimmer, C., Keith, A., Wiley, J., Raffaele, H., Mcfarland, K. & Fernande...
Erard Christian. Clarke, T. - Birds of the Atlantic Islands. Canary Islands, Madeira, Azores, Cape V...
Erard Christian. Jones, H. L. — Birds of Belize. Helm Field Guides. Christopher Helm, A & C Black Pu...
Bourlière François. Smith S.-B. — British Waders in their Haunts. London, Bell, 1960. In: La Terre e...
Erard Chr. Olsen, K. M. & Larsson, H. — Gulls of Europe, Asia and North America. Helm field guides. ...
Erard Christian. Dickinson, E.C. (ed.). — The Howard and Moore complete checklist of the birds of th...
Erard Christian. Brewer, D. — Wrens, dippers and thrashers. Helm identification guides. Christopher ...
Erard Christian. Kiwan, G. M., Boyla, K., Castastastell, P., Demirci, B., Özen, M., Welch, H. & Marl...
Erard Christian. Brown, R., Ferguson, J., Lawrence, M. & Lees, D. — Tracks and signs of the birds of...
Erard Christian. Clement, P. & Hathway, R. — Thrushes. Helm Identification Guides. Christopher Helm,...
Erard Christian. Rees, D. — Bewick’s Swan. T & A D Poyser, A& C Black Publishers Ltd, London. 2006. ...
Erard Christian. Fry, C. H., Keith, S. & Urban, E. K. (eds). — The birds of Africa. Volume VII. Spar...
Erard Christian. Lever, C. — Naturalised birds of the world. T & AD Poyser, A & C Black Publishers, ...
Erard Christian. Robson, C. — A field guide to the birds of South-East Asia. New Holland Publishers ...
Erard Christian. König, C. & Weickck, F. — Owls of the world. Christopher Helm, A& C Black Publisher...
Erard Christian. Latta, S., Rimmer, C., Keith, A., Wiley, J., Raffaele, H., Mcfarland, K. & Fernande...
Erard Christian. Clarke, T. - Birds of the Atlantic Islands. Canary Islands, Madeira, Azores, Cape V...
Erard Christian. Jones, H. L. — Birds of Belize. Helm Field Guides. Christopher Helm, A & C Black Pu...
Bourlière François. Smith S.-B. — British Waders in their Haunts. London, Bell, 1960. In: La Terre e...
Erard Chr. Olsen, K. M. & Larsson, H. — Gulls of Europe, Asia and North America. Helm field guides. ...
Erard Christian. Dickinson, E.C. (ed.). — The Howard and Moore complete checklist of the birds of th...
Erard Christian. Brewer, D. — Wrens, dippers and thrashers. Helm identification guides. Christopher ...
Erard Christian. Kiwan, G. M., Boyla, K., Castastastell, P., Demirci, B., Özen, M., Welch, H. & Marl...
Erard Christian. Brown, R., Ferguson, J., Lawrence, M. & Lees, D. — Tracks and signs of the birds of...
Erard Christian. Clement, P. & Hathway, R. — Thrushes. Helm Identification Guides. Christopher Helm,...
Erard Christian. Rees, D. — Bewick’s Swan. T & A D Poyser, A& C Black Publishers Ltd, London. 2006. ...
Erard Christian. Fry, C. H., Keith, S. & Urban, E. K. (eds). — The birds of Africa. Volume VII. Spar...
Erard Christian. Lever, C. — Naturalised birds of the world. T & AD Poyser, A & C Black Publishers, ...
Erard Christian. Robson, C. — A field guide to the birds of South-East Asia. New Holland Publishers ...
Erard Christian. König, C. & Weickck, F. — Owls of the world. Christopher Helm, A& C Black Publisher...