Washington (State). Division of Geology and Earth Resources. (1974). Energy resources of Washington. Division of Geology and Earth Resources; for sale by the Dept. of Natural Resources.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रWashington (State). Division of Geology and Earth Resources. Energy Resources of Washington. Olympia, Wash.: Division of Geology and Earth Resources; for sale by the Dept. of Natural Resources, 1974.
एमएलए (8वां संस्करण) प्रशस्ति पत्रWashington (State). Division of Geology and Earth Resources. Energy Resources of Washington. Division of Geology and Earth Resources; for sale by the Dept. of Natural Resources, 1974.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.