Gordon, D. G. (1993). Preserving Washington wildlands: A guide to the Nature Conservancy's preserves in Washington. Nature Conservancy, Washington Chapter ; Distributed by The Mountaineers Books.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Gordon, David G. Preserving Washington Wildlands: A Guide to the Nature Conservancy's Preserves in Washington. Seattle, WA : Seattle, WA: Nature Conservancy, Washington Chapter ; Distributed by The Mountaineers Books, 1993.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Gordon, David G. Preserving Washington Wildlands: A Guide to the Nature Conservancy's Preserves in Washington. Nature Conservancy, Washington Chapter ; Distributed by The Mountaineers Books, 1993.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.