Chhokar,kiran B. (2004). Underrstanding environment. SAGE Publications.
Lua i Stíl Chicago (17ú heag.)Chhokar,kiran B. Underrstanding Environment. SAGE Publications, 2004.
Lua MLA (9ú heag.)Chhokar,kiran B. Underrstanding Environment. SAGE Publications, 2004.
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