Sharma, D., & Chhabra, B. S. (2007). Environmental studies (as per syllabus of HP University). New Age International (P) Ltd., Publishers.
Dyfyniad Arddull ChicagoSharma, Deepa, and Bhupendra Singh Chhabra. Environmental Studies (as Per Syllabus of HP University). New Delhi: New Age International (P) Ltd., Publishers, 2007.
Dyfyniad MLASharma, Deepa, and Bhupendra Singh Chhabra. Environmental Studies (as Per Syllabus of HP University). New Age International (P) Ltd., Publishers, 2007.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.