Cita APA (7th ed.)
Sharma, D., & Chhabra, B. S. (2007). Environmental studies (as per syllabus of HP University). New Age International (P) Ltd., Publishers.
Cita Chicago (17th ed.)
Sharma, Deepa, i Bhupendra Singh Chhabra. Environmental Studies (as Per Syllabus of HP University). New Delhi: New Age International (P) Ltd., Publishers, 2007.
Cita MLA (9th ed.)
Sharma, Deepa, i Bhupendra Singh Chhabra. Environmental Studies (as Per Syllabus of HP University). New Age International (P) Ltd., Publishers, 2007.
Atenció: Aquestes cites poden no estar 100% correctes.