Sarmiento, Agnes Cenen E. ; et al.,  c2009. <br/><br/>
Plane and Spherical Trigonometry / 
Sarmiento, Agnes Cenen E. ; et al. 
 - Mandaluyong City :  Books Atbp. Publishing Corp,  c2009. 
 - vi ; 157p. :  ill. ;  8.5 inch. 
<br/><br/><label>ISBN: </label>978-971-0388-77-6