J.K, A., Bergado, J, J., C., J.A, D. V., A., G., G.R., M. and R, Q. (2026) “Formulation of Eco-Crayons Using Organic Pigments and Natural Waxes (Soy Wax, Palm Wax, and Beeswax)”, International Journal of Progressive Research in Science and Engineering , 7(03), pp. 37–46. doi: 10.65138/ijprse.2026.v7i03.1255.