William P. Cunningham, M. A. C. Environmental science a global concern. McGraw-Hill.
Chicago Style (17th ed.) CitationWilliam P. Cunningham, Mary Ann Cunningham. Environmental Science a Global Concern. McGraw-Hill.
MLA引文William P. Cunningham, Mary Ann Cunningham. Environmental Science a Global Concern. McGraw-Hill.
警告:這些引文格式不一定是100%准確.