Ocampo, A., 		Ocampo, M., & 		Galam, R.
(2011).
 Textbuk sa Agham at Matematika.
<em>Alipato, A Journal Of Basic Education, 1</em>(1).
Retrieved from <a href="https://journals.upd.edu.ph/index.php/ali/article/view/2647" target="_new">https://journals.upd.edu.ph/index.php/ali/article/view/2647</a>