@book{31935,
	author = {Singh, Sita Ram},
	title = {Agro Diversity and cropping pattern},
	publisher = {APH. Publishing Corporation},
	year = {2009},
	address = {New Delhi},
	note = {Includdes bibliogrephial refernces },
	url = {http://www.loc.gov/catdir/toc/ecip0721/2007025342.html}
}