@book{1961,
	author = {Cassidy, James T. and Laxer, Ronald M.},
	title = {Textbook of pediatric rheumatology },
	publisher = {Elsevier Saunders,},
	year = {2011.},
	address = {Philadelphia :},
	edition = {6th ed.},
	url = {https://books.google.com.pk/books?id=oEemcpeEufoC&printsec=frontcover&dq=9781416065814&hl=en&sa=X&ved=2ahUKEwiA07HB2bD1AhXT7eAKHc5YDiAQ6AF6BAgGEAI#v=onepage&q&f=false}
}