@book{3257,
	author = {Sarkar, Swapan Kumar.},
	title = {A Textbook of Discrete Mathematics },
	publisher = {S Chand & Co Ltd,},
	year = {2003.},
	address = {New Delhi},
	url = {http://www.amazon.com/exec/obidos/ASIN/8121922321/chopaconline-20}
}