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  1. By: Simpson, W H
    Type: Article
    In: Ibis
    Volume: 1
    Issue: 3
    Date: 1859
    Page Range: 264--273
    Publication Info: [London], Published for the British Ornithologists' Union by Academic Press,
  2. By: Simpson, W H
    Type: Article
    In: Ibis
    Volume: 2
    Issue: 4
    Date: 1860
    Page Range: 375--378
    Publication Info: [London], Published for the British Ornithologists' Union by Academic Press,
  3. By: Simpson, W H
    Type: Article
    In: Ibis
    Volume: 2
    Issue: 3
    Date: 1860
    Page Range: 279--296
    Publication Info: [London], Published for the British Ornithologists' Union by Academic Press,
  4. By: Simpson, W H
    Type: Article
    In: Ibis
    Volume: 3
    Issue: 4
    Date: 1861
    Page Range: 361--374
    Publication Info: [London], Published for the British Ornithologists' Union by Academic Press,