@book{4815,
	author = {Trisha Greenhalgh},
	title = {How to read a Paper},
	publisher = {BMJ Publishing},
	year = {1997},
	address = {London},
	url = {https://books.google.com.pk/books?id=q-92iFMFJGwC&printsec=frontcover&dq=How+to+read+a+paper+:+the+basics+of+evidence+based+medicine&hl=en&sa=X&ved=2ahUKEwjXmbGWn8_1AhWUi1wKHakICwk}
}