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  1. By: Newton, Edward - Gadow, Hans,
    Type: Article
    In: Transactions of the Zoological Society of London
    Volume: 13
    Date: 1893
    Page Range: 281--302
    Publication Info: [London], Published for the Zoological Society of London by Academic Press,
  2. By: Newton, Alfred, - Newton, Edward
    Type: Article
    In: Ibis
    Volume: 6
    Series: 5
    Issue: 4
    Date: 1888
    Page Range: 474--476
    Publication Info: [London], Published for the British Ornithologists' Union by Academic Press,