@book{1331,
	author = {Sullivan, William G. and Wicks, Elin M.},
	title = {Engineering Economy.},
	publisher = {Pearson,},
	year = {2014.},
	address = {Upper Saddle River :},
	edition = {16th ed.},
	url = {https://books.google.com.pk/books/about/Engineering_Economy.html?id=4ot-AgAAQBAJ&source=kp_book_description&redir_esc=y}
}