Abrenica, M. G.; Alba, J.; Dumago, P. M.; Evangelista, M.; Monreal, J.; Seciban, K. A. Development, Evaluation and Heavy Metal Analysis of Tailor’s Chalk Using Eggshell and Green Apple Snail Shell in Three Formulations. IJERIP 2026, 2 (5), 1125-1134. https://doi.org/10.5281/zenodo.20324229.