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  1. By: Ashcroft, Carl J - Sheffield, Elizabeth
    Type: Article
    In: American fern journal
    Volume: 90
    Date: 2000
    Page Range: 91--99
    Publication Info: [Washington, etc.] American Fern Society
  2. By: Raine, Catherine A - Farrar, Donald R., - Sheffield, Elizabeth
    Type: Article
    In: American fern journal
    Volume: 81
    Date: 1991
    Page Range: 109--118
    Publication Info: [Washington, etc.] American Fern Society
  3. By: Simán, Sanna E - Sheffield, Elizabeth
    Type: Article
    In: American fern journal
    Volume: 92
    Date: 2002
    Page Range: 30--38
    Publication Info: [Washington, etc.] American Fern Society