Saxena, y. (2004). Environment explained: Meaning and definitions of terms and themes. Excel.
Chicago-referens (17:e uppl.)Saxena, y. Environment Explained: Meaning and Definitions of Terms and Themes. New Delhi: Excel, 2004.
MLA-referens (9:e uppl.)Saxena, y. Environment Explained: Meaning and Definitions of Terms and Themes. Excel, 2004.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.