Tohutoro APA (7th ed.)
Sharma, D., & Chhabra, B. S. (2007). Environmental studies (as per syllabus of HP University). New Age International (P) Ltd., Publishers.
Tohutoru Kātū Chicago (17th ed.)
Sharma, Deepa, me Bhupendra Singh Chhabra. Environmental Studies (as Per Syllabus of HP University). New Delhi: New Age International (P) Ltd., Publishers, 2007.
Tohutoro MLA (9th ed.)
Sharma, Deepa, me Bhupendra Singh Chhabra. Environmental Studies (as Per Syllabus of HP University). New Age International (P) Ltd., Publishers, 2007.
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