@book{9,
	author = {Prentice, William E.},
	title = {Arnheim's principles of athletic traning:},
	publisher = {Mc Graw Hill,},
	year = {c2006.},
	address = {Boston:},
	edition = {12th ed.},
	url = {https://books.google.com.pk/books?id=ML2btAEACAAJ&dq=0071119809&hl=en&sa=X&redir_esc=y}
}