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.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Dake, 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.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Dake, 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.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.