Cunningham, W. P., & Cunningham, M. A. (2007). Principles of environmental science: Inquiry and applications (4th ed.). Tata McGraw-Hill.
استشهاد بنمط شيكاغوCunningham, William P., و Mary Ann Cunningham. Principles of Environmental Science: Inquiry and Applications. 4th ed. New Delhi: Tata McGraw-Hill, 2007.
MLA استشهادCunningham, William P., و Mary Ann Cunningham. Principles of Environmental Science: Inquiry and Applications. 4th ed. Tata McGraw-Hill, 2007.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.