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  1. By: Balen, Bas van, - Suwelo, I S - Hadi, Dwi S. - Soepomo, D - Marlon, Reze
    Type: Article
    In: Forktail
    Volume: 8
    Date: 1993
    Page Range: 83--88
    Publication Info: Oxford,
  2. By: Balen, Bas van, - Eggenkamp, H. H. (Erik)
    Type: Article
    In: Forktail
    Volume: 27
    Date: 2011
    Page Range: 91--92
    Publication Info: Oxford,
  3. By: Bashari, Hanom - Balen, Bas van,
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 134
    Issue: 4
    Date: 2014
    Page Range: 302--304
    Publication Info: London, British Ornithologists' Club, 1893-
  4. By: Balen, Bas van,
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 118
    Date: 1998
    Page Range: 118--119
    Publication Info: London, British Ornithologists' Club, 1893-
  5. By: Balen, Bas van,
    Type: Article
    In: Forktail
    Volume: 13
    Date: 1998
    Page Range: 121--122
    Publication Info: Oxford,
  6. By: Irham, Mohammad - Meuaard, E - Balen, Bas van,
    Type: Article
    In: Forktail
    Volume: 28
    Date: 2012
    Page Range: 162--163
    Publication Info: Oxford,
  7. By: Balen, Bas van,
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 121
    Date: 2001
    Page Range: 94--98
    Publication Info: London, British Ornithologists' Club, 1893-
  8. By: Collar, Nigel J - Balen, Bas van,
    Type: Article
    In: Forktail
    Volume: 29
    Date: 2013
    Page Range: 15--18
    Publication Info: Oxford,
  9. By: Balen, Bas van, - Nijman, Vincent
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 116
    Date: 1996
    Page Range: 173--174
    Publication Info: London, British Ornithologists' Club, 1893-
  10. By: Eaton, James A. (Conservationist) - Shepherd, C R - Rheindt, F E - Harris, J B C - Balen, Bas van, - Wilcove, David Samuel - Collar, Nigel J
    Type: Article
    In: Forktail
    Volume: 31
    Date: 2015
    Page Range: 1--12
    Publication Info: Oxford,
  11. By: Balen, Bas van,
    Type: Article
    In: The journal of raptor research
    Volume: 32
    Issue: 1
    Date: 1998
    Page Range: 56--63
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-