@book{1615,
	author = {Jensen, Cencil and Helsel, Jay D.},
	title = {Engineering Drawing and Design},
	publisher = {McGraw Hill,},
	year = {2016.},
	address = {Chennai :},
	edition = {7th ed.},
	url = {https://books.google.com.pk/books?id=Rn89PwAACAAJ&dq=Engineering+drawing+and+design+7th+ed&hl=en&sa=X&ved=2ahUKEwij_MXo9Lr2AhWJyqQKHXRqA-cQ6AF6BAgIEAI}
}