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  1. By: Bennett, K. H. - Young, James B - Cordeaux, John. - Butler, Edward Albert, - Salvadori, Tommaso, - Salvin, P H - Blaauw, Frans Ernst,
    Type: Article
    In: Ibis
    Volume: 3
    Series: 6
    Issue: 1
    Date: 1891
    Page Range: 143--156
    Publication Info: [London], Published for the British Ornithologists' Union by Academic Press,
  2. By: Young, James B
    Type: Article
    In: The Wilson bulletin
    Volume: 60
    Issue: 1
    Date: 1948
    Page Range: 62--71
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-