@book{155,
	author = {Gallin, John I. and Ognibene, Frederick P. (Editor)},
	title = {Principles and practice of clinical research },
	publisher = {Elsevier/AP ,},
	year = {2012 .},
	address = {Amsterdam :},
	edition = {3rd ed.},
	url = {https://books.google.com.pk/books?id=o6-F8I4LJLgC&printsec=frontcover&dq=Principles+and+practice+of+clinical+research&hl=en&sa=X&ved=2ahUKEwjQ6Ifi9-r0AhWoPOwKHfpcBp0Q6AF6BAgEEAI#v=onepage&q=Principles%20and%20practice%20of%20clinical%20research&f=false}
}