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  1. Note on the Cedrela psyllids (genus Freysuila Aleman)
    By: A., Schwarz E
    Type: Article
    In: Proceedings of the Entomological Society of Washington
    Volume: 4
    Date: 1899
    Page Range: 195--197
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  2. Notes on North American Psyllidae
    By: A., Schwarz E
    Type: Article
    In: Proceedings of the Entomological Society of Washington
    Volume: 6
    Date: 1904
    Page Range: 234--245
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