Klemgard, E. N. (1958). A utilization survey of the nonmetallic minerals of the State of Washington. Division of Industrial Research, State College of Washington.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रKlemgard, E. N. A Utilization Survey of the Nonmetallic Minerals of the State of Washington. Pullman, Wash.: Division of Industrial Research, State College of Washington, 1958.
एमएलए (8वां संस्करण) प्रशस्ति पत्रKlemgard, E. N. A Utilization Survey of the Nonmetallic Minerals of the State of Washington. Division of Industrial Research, State College of Washington, 1958.
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