Washington (State). Division of Geology and Earth Resources. Publications of the Washington Division of Geology and Earth Resources. The Division.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रWashington (State). Division of Geology and Earth Resources. Publications of the Washington Division of Geology and Earth Resources. Olympia, WA: The Division.
एमएलए (8वां संस्करण) प्रशस्ति पत्रWashington (State). Division of Geology and Earth Resources. Publications of the Washington Division of Geology and Earth Resources. The Division.
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