Sharma, D., & Chhabra, B. S. (2007). Environmental studies (as per syllabus of HP University). New Age International (P) Ltd., Publishers.
Citace podle Chicago (17th ed.)Sharma, Deepa, a Bhupendra Singh Chhabra. Environmental Studies (as Per Syllabus of HP University). New Delhi: New Age International (P) Ltd., Publishers, 2007.
Citace podle MLA (9th ed.)Sharma, Deepa, a Bhupendra Singh Chhabra. Environmental Studies (as Per Syllabus of HP University). New Age International (P) Ltd., Publishers, 2007.
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