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  1. By: Sperka, C L - Freytag, Paul H
    Type: Article
    In: Transactions of the Kentucky Academy of Science
    Volume: 36
    Issue: 3-4
    Date: 1975-09
    Page Range: 57--62
    Publication Info: [Lexington, Ky.], Kentucky Academy of Science, 1923-1997
  2. By: Sperka, C L
    Type: Article
    In: Entomological news
    Volume: 83
    Date: 1972
    Page Range: 282--283
    Publication Info: [Philadelphia], American Entomological Society, 1925-
  3. By: Johnson, Victor - Sperka, C L
    Type: Article
    In: Transactions of the Kentucky Academy of Science
    Volume: 33
    Issue: 1-2
    Date: 1972
    Page Range: 40--40
    Publication Info: [Lexington, Ky.], Kentucky Academy of Science, 1923-1997