Core, E. L., & Ammons, N. P. (1999). Woody plants in winter: A manual of common trees and shrubs in winter in the northeastern United States and southeastern Canada. West Virginia University Press.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Core, Earl Lemley, و Nelle P. Ammons. Woody Plants in Winter: A Manual of Common Trees and Shrubs in Winter in the Northeastern United States and Southeastern Canada. Morgantown: West Virginia University Press, 1999.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)Core, Earl Lemley, و Nelle P. Ammons. Woody Plants in Winter: A Manual of Common Trees and Shrubs in Winter in the Northeastern United States and Southeastern Canada. West Virginia University Press, 1999.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.