Não informado. (1986). Washington Park Arboretum bulletin. University of Washington, Arboretum Foundation.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Washington Park Arboretum Bulletin. Seattle, Wash: University of Washington, Arboretum Foundation, 1986.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Washington Park Arboretum Bulletin. University of Washington, Arboretum Foundation, 1986.
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