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  1. By: Ritter, W E - Forsyth, Ruth A. (Ruth Agnes),
    Type: Article
    In: University of California publications in zoology
    Volume: 16
    Date: 1917
    Page Range: 439--512
    Publication Info: Berkeley, University Press, 1906-
  2. By: Ritter, W E
    Type: Article
    In: Annotationes zoologicae japonenses / Nihon dōbutsugaku ihō
    Volume: 6
    Issue: 1
    Date: 1906
    Page Range: 1--5
    Publication Info: Tokyo, Societas, 1897-[1983]
  3. By: Ritter, W E
    Type: Article
    In: Zoologischer Anzeiger
    Volume: 27
    Date: 1904
    Page Range: 650--651
    Publication Info: Jena VEB Gustav Fischer Verlag
  4. By: Ritter, W E
    Type: Article
    In: Proceedings of the United States National Museum
    Volume: 45
    Date: 1913
    Page Range: 427--505
    Publication Info: Washington Smithsonian Institution Press, [etc.]