Cunningham, W. P. (2002). Principles of environmental science: Inquiry and Applications. Boston, MA: McGraw-Hill.
استشهاد بنمط شيكاغوCunningham, William P. Principles of Environmental Science: Inquiry and Applications. Boston, MA: McGraw-Hill, 2002.
MLA استشهادCunningham, William P. Principles of Environmental Science: Inquiry and Applications. Boston, MA: McGraw-Hill, 2002.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.