@book{1398,
	author = {Polit, Denise F.,},
	title = { Essentials of nursing research : appraising evidence for nursing practice},
	publisher = {Wolters Kluwer,},
	year = {2018.},
	address = {Philadephia:},
	edition = {9th ed.},
	url = {https://books.google.com.pk/books?id=Z6DwjwEACAAJ&dq=9781496358356&hl=en&sa=X&redir_esc=y}
}