@book{2706,
	author = {Morton, Richard F.(Editor)},
	title = {A study guide to epidemiology and biostatistics },
	publisher = {Aspen Publishers ,},
	year = {1990 .},
	address = {Rockville :},
	edition = {3rd ed.},
	url = {https://books.google.com.pk/books?id=WL5pAAAAMAAJ&q=0834201577&dq=0834201577&hl=en&sa=X&redir_esc=y}
}