@book{32586,
	author = {Akhatar, Ahsan and Ahsan, Sabiha},
	title = {Textbook of Differential calculus},
	publisher = {PHI Learining p.Ltd},
	year = {2009},
	address = { New Delhi},
	edition = {2nd ed.},
	note = {Includes bibliographical reference and index.}
}