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  1. By: Spengel, J W
    Type: Article
    In: Mittheilungen aus der Zoologischen Station zu Neapal
    Volume: 1
    Date: 1879
    Page Range: 357--419
    Publication Info: Leipzig, Wilhelm Engelmann, 1879-1921
  2. By: Spengel, J W
    Type: Article
    In: Zoologische Jahrbücher
    Volume: 15
    Date: 1902
    Page Range: 209--218
    Publication Info: Jena [Germany], G. Fischer,
  3. By: Spengel, J W
    Type: Article
    In: Zoologische Jahrbücher
    Volume: 5
    Date: 1891
    Page Range: 920--922
    Publication Info: Jena [Germany], G. Fischer,
  4. By: Spengel, J W
    Type: Article
    In: Zoologische Jahrbücher
    Volume: 20
    Date: 1904
    Page Range: 1--18
    Publication Info: Jena [Germany], G. Fischer,
  5. By: Spengel, J W
    Type: Article
    In: Zoologische Jahrbücher
    Volume: 20
    Date: 1904
    Page Range: 413--428
    Publication Info: Jena [Germany], G. Fischer,
  6. By: Spengel, J W
    Type: Article
    In: Mittheilungen aus der Zoologischen Station zu Neapal
    Volume: 3
    Date: 1881-12-09
    Page Range: 15--52
    Publication Info: Leipzig, Wilhelm Engelmann, 1879-1921
  7. By: Spengel, J W
    Type: Article
    In: Zoologische Jahrbücher
    Volume: 13
    Date: 1900
    Page Range: 205--206
    Publication Info: Jena [Germany], G. Fischer,
  8. By: Bütschli, Otto, - Carus, Julius Victor, - Döderlein, Ludwig, - Ehlers, Ernst Heinrich, - Ludwig, H W - Möbius, Karl August, - Schulze, Franz Eilhard, - Spengel, J W
    Type: Article
    In: Archiv für Naturgeschichte
    Volume: 61
    Issue: 1
    Date: 1895
    Page Range: 362--371
    Publication Info: Berlin, Nicolai, 1835-
  9. By: Spengel, J W
    Type: Article
    In: Mittheilungen aus der Zoologischen Station zu Neapal
    Volume: 5
    Date: 1884
    Page Range: 494--508
    Publication Info: Leipzig, Wilhelm Engelmann, 1879-1921