Severino A. Espiritu & Antonina C. Sta. Maria,  1987. <br/><br/>
College Algebra and Trigonometry Workbook with Tables / 
Severino A. Espiritu & Antonina C. Sta. Maria. 
 - Philippines :  National Bookstore, Inc,  1987. 
<br/><br/><label>ISBN: </label>971-08-4047-9