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  1. By: Speiser, R
    Type: Article
    In: Zoologische Jahrbücher
    Volume: 7
    Date: 1904
    Page Range: 373--380
    Publication Info: Jena Gustav Fischer 1886-1929
  2. By: Bosakowski, Thomas - Speiser, R - Smith, Dwight G - Niles, L J
    Type: Article
    In: The journal of raptor research
    Volume: 27
    Issue: 1
    Date: 1993
    Page Range: 26--30
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-
  3. By: Speiser, R - Bosakowski, Thomas
    Type: Article
    In: The journal of raptor research
    Volume: 25
    Issue: 4
    Date: 1991
    Page Range: 132--135
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-