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  1. By: Sørensen, William,
    Publication info: Kjøbenhavn, V. Thaning & Appels boghandel, trykt hos J.H. Schultz, 1884
    Holding Institution: Harvard University, Museum of Comparative Zoology, Ernst Mayr Library
  2. By: Hansen, H. J. (Hans Jacob), - Sørensen, William, - Royal Society (Great Britain)
    Publication info: Cambridge [Eng.], University Press, 1904
    Holding Institution: Harvard University, Museum of Comparative Zoology, Ernst Mayr Library