Ferdinand P. Nocon, Joel T. Torrecampo, Loreta B. Torrecampo, Wilfredo B. Daguia, Edna G. Ofrasio,  2001. <br/><br/>
Trigonometry made simple for filipinos tex/workbook / 
Ferdinand P. Nocon, Joel T. Torrecampo, Loreta B. Torrecampo, Wilfredo B. Daguia, Edna G. Ofrasio. 
 - 1st edition. 
 -  271 p. 
<br/><br/><label>ISBN: </label>971-08-6166-2