O'Connor, G., & Wieda, K. (2001). Northwest arid lands: An introduction to the Columbia Basin shrub-steppe. Battelle Press ; Distributed by University of Washington Press.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)O'Connor, Georganne, و Karen Wieda. Northwest Arid Lands: An Introduction to the Columbia Basin Shrub-steppe. Columbus, OH : Seattle, WA: Battelle Press ; Distributed by University of Washington Press, 2001.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)O'Connor, Georganne, و Karen Wieda. Northwest Arid Lands: An Introduction to the Columbia Basin Shrub-steppe. Battelle Press ; Distributed by University of Washington Press, 2001.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.