Washington (State). Division of Geology and Earth Resources & Stoffel, K. L. (1991). Geologic map of Washington, northeast quadrant. Washington Division of Geology and Earth Resources.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Washington (State). Division of Geology and Earth Resources و Keith L. Stoffel. Geologic Map of Washington, Northeast Quadrant. [Olympia, Wash.]: Washington Division of Geology and Earth Resources, 1991.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Washington (State). Division of Geology and Earth Resources و Keith L. Stoffel. Geologic Map of Washington, Northeast Quadrant. Washington Division of Geology and Earth Resources, 1991.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.