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  1. By: Burckhardt, Rudolf,
    Publication info: Leipzig, G.J. Göschen, 1907
    Holding Institution: University of Toronto - Gerstein Science Information Centre
  1. By: Burckhardt, Rudolf,
    Type: Article
    In: The Annals and magazine of natural history; zoology, botany, and geology
    Volume: 6
    Series: 7
    Date: 1900
    Page Range: 558--568
    Publication Info: London Taylor and Francis, Ltd
  2. By: Burckhardt, Rudolf,
    Type: Article
    In: Zoologische Jahrbücher
    Volume: 15
    Date: 1902
    Page Range: 499--536
    Publication Info: Jena [Germany], G. Fischer,