@book{4031,
	author = {Halloran, M. Elizabeth and Longini, Ira M.},
	title = {Design and analysis of vaccine studies},
	publisher = {Springer, },
	year = {2010.},
	address = {New York :},
	url = {https://books.google.com.pk/books?id=OWFDAAAAQBAJ&printsec=frontcover&dq=Design+and+analysis+of+vaccine+studies&hl=en&sa=X&redir_esc=y#v=onepage&q=Design%20and%20analysis%20of%20vaccine%20studies&f=false}
}