@book{3259,
	author = {Roitt, Ivan M.},
	title = {Essential Immunology},
	publisher = {Blackwell Scientific,},
	year = {1980.},
	address = {Oxford :},
	edition = {4th ed.},
	url = {https://books.google.com.pk/books?id=slB4DQAAQBAJ&printsec=frontcover&dq=Essential+immunology&hl=en&sa=X&redir_esc=y#v=onepage&q=Essential%20immunology&f=false}
}