1. Aniano, L. C. (2010). Difficulties in solving word problems on fractions among grade VI pupils of Balara Elementary School [Unpublished master’s thesis]. University of Rizal.
2. Aremu, E. O. (1999). Strategies for Improving the performance of female pupils in mathematics. African Journal of Educational Research, 5(1), 77-85.
3. Ayara, N. J., Udom, U. D., & Esuong U. U. (2019). Self-concept and student’s perception of learning environment in mathematics in Akwa Ibom State. Interdisciplinary Journal of Science Education, 1(1), 54-56.
4. Bardillion, R. U. (2004). Students’ Filipino verbal and symbolic translations, problem-solving ability and attitude towards mathematics word problems [Unpublished master’s thesis]. University of the Philippines.
5. Burns, M. (2007). About teaching mathematics: A K-8 resource. Math Solutions.