ISBN 978-621-8402-28-7 (EPUB) ISBN 978-621-8402-30-0 (PDF read only) ISBN 978-621-8402-31-7 (PDF downloadable) Author Fahad A. Salendab, Ranulfo L. Visaya Jr., Geneva M. Eler, Edmer D. Bernardo, Sanny F. Fermadez