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  1. The English Sparrow Problem
    By: Estabrook, A H
    Type: Article
    In: The Auk.
    Volume: 23
    Date: 1906
    Page Range: 246--246
    Publication info: Washington, D.C. :American Ornithologists' Union, etc.,1884-
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  2. The Present Status of the English Sparrow Problem in America
    By: Estabrook, A H
    Type: Article
    In: The Auk.
    Volume: 24
    Date: 1907
    Page Range: 129--134
    Publication info: Washington, D.C. :American Ornithologists' Union, etc.,1884-
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