Das, B.C. . <br/><br/>
Intermediate Trigonometry /  Textual Documents 
B.C.Das & B.N.Mukherjee. 
 - 27th ed. / 
 - Calcutta :  U. N. Dhur & Sons Pvt. Ltd. ,  1968. 
 - 282p. ;  20cm. 
<br/><br/><label>Subjects--Index Terms: </label>Trigonometry G-Mathematics 
<br/><br/><label>Dewey Class. No.: </label>514  / D 26 In