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  1. By: Johnson, William P - Rohwer, Frank C
    Type: Article
    In: The Wilson bulletin
    Volume: 110
    Issue: 3
    Date: 1998
    Page Range: 311--315
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-
  2. By: Gastony, Gerald Joseph - Johnson, William P
    Type: Article
    In: American fern journal
    Volume: 91
    Date: 2001
    Page Range: 197--213
    Publication Info: [Washington, etc.] American Fern Society