@book{531,
	author = {Kumar, H. D.},
	title = {Agricultural ecology /},
	publisher = {A. P. H. Publishing Corporation ;},
	year = {c2006.},
	address = {New Delhi :},
	url = {https://books.google.com.bd/books?id=tgYsf9ROAckC&printsec=frontcover&dq=Agricultural+ecology+by+H.D.+Kumar&hl=en&sa=X&ei=vQWqVIqfN4WPuAS8tYHYCQ&redir_esc=y#v=onepage&q=Agricultural%20ecology%20by%20H.D.%20Kumar&f=false}
}