@book{73,
	author = {Beiser, Arthur. and Mahajan,Shobhit},
	title = {Concepts of Modern Physics.},
	publisher = {McGraw-Hill,},
	year = {2003.},
	address = {New Delhi :},
	edition = {6th ed.},
	url = {https://books.google.com.pk/books/about/Concepts_of_Modern_Physics.html?id=Z_5QAAAAMAAJ&source=kp_book_description&redir_esc=y}
}