Culver, H. E. (1919). The coal fields of southwestern Washington. F.M. Lamborn, public printer.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रCulver, Harold Eugene. The Coal Fields of Southwestern Washington. Olympia: F.M. Lamborn, public printer, 1919.
एमएलए (8वां संस्करण) प्रशस्ति पत्रCulver, Harold Eugene. The Coal Fields of Southwestern Washington. F.M. Lamborn, public printer, 1919.
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