Chú thích Empis_borealis

  1. 1 2 Collin, J.E. (1961). British Flies VI: Empididae Part 2: Hybotinae, Empidinae (except Hilara). 4. Cambridge: Cambridge UP. tr. 329.
  2. ↑ Chandler, Peter J. (1998). Checklists of Insects of the British Isles (New Series) Part 1: Diptera. Handbooks for the Identification of British Insects. New Series. 12. London: Royal Entomological Society of London. tr. 234. ISBN 0-901546-82-8.