Bird migration
Concept
The Migration Ecology of Birds
2007 · Ian Newton · Elsevier eBooks
Handbook of the Birds of Europe, the Middle East and North Africa; the Birds of the Western Palearctic
1978 · H. N. Southern, Stanley Cramp · Journal of Animal Ecology
Links between worlds: unraveling migratory connectivity
2002 · Michael S. Webster, Peter P. Marra, et al. · Trends in Ecology & Evolution