Ward, E. H. (2020). The gray wolf under the Endangered Species Act (ESA): A case study in the listing and delisting challenges ([Library of Congress public edition].). Congressional Research Service.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Ward, Erin H. The Gray Wolf Under the Endangered Species Act (ESA): A Case Study in the Listing and Delisting Challenges. [Library of Congress public edition]. [Washington, D.C.]: Congressional Research Service, 2020.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Ward, Erin H. The Gray Wolf Under the Endangered Species Act (ESA): A Case Study in the Listing and Delisting Challenges. [Library of Congress public edition]. Congressional Research Service, 2020.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.