real-time information on bird migrationMigrationEcology Group, Lund University, Sweden Migrate.ou.edu(页面存档备份,存于互联网档案馆) - Migration Interest Group: Research
of Ancient South Asia. 1995. ISBN 978-3-11-014447-5. Shaffer, Jim G. Migration, Philology and South Asian Archaeology. Ed. Bronkhorst and Deshpande (编)