J.K, A.; BERGADO, J; J., C.; J.A, D. V.; A., G.; G.R., M.; R, Q. 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 , [S. l.], v. 7, n. 03, p. 37–46, 2026. DOI: 10.65138/ijprse.2026.v7i03.1255. Disponível em: https://journal.ijprse.com/index.php/ijprse/article/view/1255. Acesso em: 1 apr. 2026.