Erard Christian. Brewer, D. — Wrens, dippers and thrashers. Helm identification guides. Christopher Helm, A & C Black Publishers Ltd, London. 2001. In: Revue d'Écologie (La Terre et La Vie), tome 58, n°3, 2003. p. 357
Erard Christian. Turner, A. — The Barn Swallow. T & A D Poyser, Christopher Helm, A & C Black Publis...
Erard Christian. Dickinson, E.C. (ed.). — The Howard and Moore complete checklist of the birds of th...
Erard Christian. König, C. & Weickck, F. — Owls of the world. Christopher Helm, A& C Black Publisher...
Erard Christian. Clement, P. & Hathway, R. — Thrushes. Helm Identification Guides. Christopher Helm,...
Erard Christian. Brown, R., Ferguson, J., Lawrence, M. & Lees, D. — Tracks and signs of the birds of...
Erard Christian. Alström, P. & Mild, K. (texte), Alström, P. & Zetterström, B. (illustrations). — Pi...
Erard Christian. Borrow, N. & Demey, R. — Birds of western Africa. Helm Identification Guides. Chris...
Erard Christian. Grimmett, R, Inskipp, C. & Inskipp, T. — Birds of the Indian subcontinent. Helm Ide...
Erard Christian. Jones, H. L. — Birds of Belize. Helm Field Guides. Christopher Helm, A & C Black Pu...
Erard Christian. Jaramillo, A. & Burke, P. — New World Blackbirds. The Icterids. Helm Identification...
Erard Chr. Borrow, N. & Demey, R. — Birds of western Africa. Helm Identification Guides. Christopher...
Armstrong E.-A. — The Wren. Londres, New Naturalist Monograph, n° 3, 1955, Collins. In: La Terre et ...
Erard Christian. Sibley, D. — Field guide to the birds of eastern North America. Christopher Helm, A...
Erard Christian. Message, S. & Taylor, D. — Waders of Europe, Asia and North America. Christopher He...
Erard Christian. Gill, F. & Wright, M. — Birds of the world. Recommended English names. Christopher ...
Erard Christian. Turner, A. — The Barn Swallow. T & A D Poyser, Christopher Helm, A & C Black Publis...
Erard Christian. Dickinson, E.C. (ed.). — The Howard and Moore complete checklist of the birds of th...
Erard Christian. König, C. & Weickck, F. — Owls of the world. Christopher Helm, A& C Black Publisher...
Erard Christian. Clement, P. & Hathway, R. — Thrushes. Helm Identification Guides. Christopher Helm,...
Erard Christian. Brown, R., Ferguson, J., Lawrence, M. & Lees, D. — Tracks and signs of the birds of...
Erard Christian. Alström, P. & Mild, K. (texte), Alström, P. & Zetterström, B. (illustrations). — Pi...
Erard Christian. Borrow, N. & Demey, R. — Birds of western Africa. Helm Identification Guides. Chris...
Erard Christian. Grimmett, R, Inskipp, C. & Inskipp, T. — Birds of the Indian subcontinent. Helm Ide...
Erard Christian. Jones, H. L. — Birds of Belize. Helm Field Guides. Christopher Helm, A & C Black Pu...
Erard Christian. Jaramillo, A. & Burke, P. — New World Blackbirds. The Icterids. Helm Identification...
Erard Chr. Borrow, N. & Demey, R. — Birds of western Africa. Helm Identification Guides. Christopher...
Armstrong E.-A. — The Wren. Londres, New Naturalist Monograph, n° 3, 1955, Collins. In: La Terre et ...
Erard Christian. Sibley, D. — Field guide to the birds of eastern North America. Christopher Helm, A...
Erard Christian. Message, S. & Taylor, D. — Waders of Europe, Asia and North America. Christopher He...
Erard Christian. Gill, F. & Wright, M. — Birds of the world. Recommended English names. Christopher ...
Erard Christian. Turner, A. — The Barn Swallow. T & A D Poyser, Christopher Helm, A & C Black Publis...
Erard Christian. Dickinson, E.C. (ed.). — The Howard and Moore complete checklist of the birds of th...
Erard Christian. König, C. & Weickck, F. — Owls of the world. Christopher Helm, A& C Black Publisher...