@book{231,
	author = {Haines, Michael},
	title = {An introduction to farming systems/},
	publisher = {Longman;},
	year = {1982.},
	address = {London:},
	url = {http://books.google.com.bd/books?id=70cbAQAAMAAJ&q=0582450810&dq=0582450810&hl=en&sa=X&ei=bo_oU7H-MM_f8AWJnoGwAQ&redir_esc=y}
}