Hall, H.S. Knight, S.R. <br/><br/>
Elementary trigonometry 
/H.S. Hall, S.R. Knight 
 - 4th ed. 
 - London  Macmillan  1927 
 - xv, 415 p. 
<br/><br/><label>ISBN: </label>236555 
<br/><br/><label>Dewey Class. No.: </label>516.24  / HAL