Cunninggham, W. P. (2003). Environmental science: A global concern. WCB/McGraw-Hill.
Trích dẫn kiểu ChicagoCunninggham, William P. Environmental Science: A Global Concern. WCB/McGraw-Hill, 2003.
ציטוט MLACunninggham, William P. Environmental Science: A Global Concern. WCB/McGraw-Hill, 2003.
אזהרה: ציטוטים אלה לעיתים לא מדויקים ב 100%.