Lang, Serge <br/><br/>
Calculus of several variables 
Serge Lang 
 - \\  2nd ed. 
 -  Addison-Wesley Publishing, Reading; Massachuset  1979 
 - xii., 479p., diagrs. 
<br/><br/> First published 1973 
<br/><br/><label>ISBN: </label>201042991