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  1. By: Playfair, R L
    Type: Article
    In: Proceedings of the Zoological Society of London
    Volume: 1868
    Date: 1868
    Page Range: 9--12
    Publication Info: London Academic Press, [etc.] 1833-1965
  2. By: Playfair, R L - Letourneux, M
    Type: Article
    In: The Annals and magazine of natural history; zoology, botany, and geology
    Volume: 8
    Series: 4
    Date: 1871
    Page Range: 373--394
    Publication Info: London Taylor and Francis, Ltd