Northwest Interpretive Association, Washington State University. Program of Landscape Architecture, & Oregon Public Broadcasting. (1990). The great ice age floods: Catastrophic transformation of the West. Northwest Interpretive Association.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNorthwest Interpretive Association, Washington State University. Program of Landscape Architecture, और Oregon Public Broadcasting. The Great Ice Age Floods: Catastrophic Transformation of the West. Seattle, Wash.: Northwest Interpretive Association, 1990.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNorthwest Interpretive Association, et al. The Great Ice Age Floods: Catastrophic Transformation of the West. Northwest Interpretive Association, 1990.
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