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  1. By: Johns, R J
    Type: Article
    In: The Gardens' bulletin, Singapore
    Volume: 59
    Series: 4
    Date: 2007
    Page Range: 89--104
    Publication Info: Singapore, Govt. Print. Off. [etc.],
  2. By: Yatskievych, George Alfred - Camus, Josephine (Josephine Margaret) - Gibby, Mary - Johns, R J
    Type: Article
    In: American fern journal
    Volume: 87
    Date: 1997
    Page Range: 154--154
    Publication Info: [Washington, etc.] American Fern Society
  3. By: Prance, Ghillean T. (Ghillean Tolmie), - Beentje, Henk, - Dransfield, John - Johns, R J
    Type: Article
    In: Annals of the Missouri Botanical Garden
    Volume: 87
    Date: 2000
    Page Range: 67--71
    Publication Info: St. Louis, Missouri Botanical Garden Press, 1914-