1. Bowen, G. A. (2009). Document analysis as a qualitative research method. Qualitative Research Journal, 9(2), 27-40. https://doi.org/10.3316/QRJ0902027.
2. Department of Education (2018). Senior High School Program. Retrieved from www.deped.gov.ph.
3. Department of Education (April, 2015). DepEd Order No.8 s. 2015 “Policy guidelines on classroom assessment for the k to 12 basic education program. Retrieved from www.deped.gov.ph.
4. Department of Education (August, 2016). K to 12 Curriculum Guide in Mathematics Grades 1 to 10. Retrieved from www.deped.gov.ph.
5. Department of Education (August, 2016). K to 12 Curriculum Guide in Science Grades 3 to 10. Retrieved from www.deped.gov.ph.