Harper, C. L. (2008). Environment and society: Human perspectives on environmental issues (4th ed.). Upper Saddle River, N.J.: Pearson/Prentice Hall.
استشهاد بنمط شيكاغوHarper, Charles L. Environment and Society: Human Perspectives On Environmental Issues. 4th ed. Upper Saddle River, N.J.: Pearson/Prentice Hall, 2008.
MLA استشهادHarper, Charles L. Environment and Society: Human Perspectives On Environmental Issues. 4th ed. Upper Saddle River, N.J.: Pearson/Prentice Hall, 2008.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.