Northwest Interpretive Association, Washington State University. Program of Landscape Architecture, & Oregon Public Broadcasting. (1990). The great ice age floods: Catastrophic transformation of the West. Northwest Interpretive Association.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Northwest Interpretive Association, Washington State University. Program of Landscape Architecture, و Oregon Public Broadcasting. The Great Ice Age Floods: Catastrophic Transformation of the West. Seattle, Wash.: Northwest Interpretive Association, 1990.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Northwest Interpretive Association, et al. The Great Ice Age Floods: Catastrophic Transformation of the West. Northwest Interpretive Association, 1990.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.