United States. National Park Service. Division of Publications. (1986). North Cascades: A guide to the North Cascades National Park Service complex, Washington. U.S. Dept. of the Interior.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)United States. National Park Service. Division of Publications. North Cascades: A Guide to the North Cascades National Park Service Complex, Washington. Washington, D.C.: U.S. Dept. of the Interior, 1986.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)United States. National Park Service. Division of Publications. North Cascades: A Guide to the North Cascades National Park Service Complex, Washington. U.S. Dept. of the Interior, 1986.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.