Akhtar, Ahsan Textbook of differential calculus [Book] / Ahsan Akhtar, Sabiha Ahsan. - New Delhi : Prentice Hall of India Private Limited, 2004. - xviii, 518p. ; 24 cm. Includes index All. ISBN: 8120324420 (pbk) Subjects--Topical Terms: Differential calculus. Dewey Class. No.: 515.33