Hockaday, J. (2009). Greenscapes: Olmsted's Pacific Northwest. Washington State University Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रHockaday, Joan. Greenscapes: Olmsted's Pacific Northwest. Pullman, Wash.: Washington State University Press, 2009.
एमएलए (8वां संस्करण) प्रशस्ति पत्रHockaday, Joan. Greenscapes: Olmsted's Pacific Northwest. Washington State University Press, 2009.
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