Trigonometry / 
Fe N. Reyes ; Rene P. Felix ; Felina G. Mapa ; Jesusa T. Tangco 
 - 2nd ed. 
 - Mandaluyong City :  National Book Store,  2004. 
 - 394 p.; 22.1cm. 
<br/><br/>includes index 
<br/><br/><label>ISBN: </label>9710861328 
<br/><br/><label>Dewey Class. No.: </label>Fil 516.24 R33 2004