Dake, H. C. (1962). Northwest gem trails: A field guide for the gem hunter, mineral collector, and tourist, covering both popular and little known areas of Oregon, Washington, Idaho, British Columbia (3d ed. completely rev.). Gembooks.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रDake, H. C. Northwest Gem Trails: A Field Guide for the Gem Hunter, Mineral Collector, and Tourist, Covering Both Popular and Little Known Areas of Oregon, Washington, Idaho, British Columbia. 3d ed. completely rev. Mentone, Calif.: Gembooks, 1962.
एमएलए (8वां संस्करण) प्रशस्ति पत्रDake, H. C. Northwest Gem Trails: A Field Guide for the Gem Hunter, Mineral Collector, and Tourist, Covering Both Popular and Little Known Areas of Oregon, Washington, Idaho, British Columbia. 3d ed. completely rev. Gembooks, 1962.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.