Holstine, C. E., & Hobbs, R. S. (2005). Spanning Washington: Historic highway bridges of the Evergreen State. Washington State University Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रHolstine, Craig E., और Richard S. Hobbs. Spanning Washington: Historic Highway Bridges of the Evergreen State. Pullman, Wash.: Washington State University Press, 2005.
एमएलए (8वां संस्करण) प्रशस्ति पत्रHolstine, Craig E., और Richard S. Hobbs. Spanning Washington: Historic Highway Bridges of the Evergreen State. Washington State University Press, 2005.
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