Siddons, A. W. and Hughes, R. T. <br/><br/>
Trigonometry 
Part 4 Infinite Series, Products, etc. 
 - London  Cambridge University Press  1929 
 - 404 
<br/><br/><label>Subjects--Personal Names: </label> Mathematics 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mathematics