APA-ийн эшлэл(7 дахь хэвлэлт)

Sharma, D., & Chhabra, B. S. (2007). Environmental studies (as per syllabus of HP University). New Age International (P) Ltd., Publishers.

Чикаго-гийн эшлэл (17 дахь хэвлэлт)

Sharma, Deepa, ба Bhupendra Singh Chhabra. Environmental Studies (as Per Syllabus of HP University). New Delhi: New Age International (P) Ltd., Publishers, 2007.

MLA -ийн эшлэл (9 дэх хэвлэлт)

Sharma, Deepa, ба Bhupendra Singh Chhabra. Environmental Studies (as Per Syllabus of HP University). New Age International (P) Ltd., Publishers, 2007.