@book{1429,
	author = {Bluman, Allan G.},
	title = {Elementary statistics : a step by step approach},
	publisher = {Mc Graw Hill Education,},
	year = {2015.},
	address = {New york :},
	edition = {7th ed.},
	url = {https://books.google.com.pk/books?id=zCl3tAEACAAJ&dq=9780077720582&hl=en&sa=X&ved=2ahUKEwjbzLDt29b2AhVpzoUKHePfBfoQ6AF6BAgJEAI}
}