Literature
  • 1996
  • The Macmillan Birder's Guide to European and Middle Eastern Birds. Macmillan, London. 248 pp.
  • 1989
  • The Macmillan Field Guide to Bird Identification. Macmillan, London.
  • Hermans 1996
  • Identification of bird remains after bird airplane collisions, based on DNA sequence analysis. 23rd meeting Bird Strike Committee Europe (London). Working Paper 19: 203-207.
  • Horton 1990
  • Distinguishing between ducks, geese and swans by means of feather micro-biometrics. 20th Meeting Bird Strike Committee Europe (Helsinki). Working Paper 32: 327-337.