NHUNG, Trần Văn.
 Educational Triangular Pyramid:  A New Concept in Education.
<strong>VNU Journal of Science: Education Research</strong>, [S.l.], v. 30, n. 4, dec. 2014.
ISSN 2588-1159.
Available at: &lt;<a href="https://js.vnu.edu.vn/ER/article/view/299" target="_new">https://js.vnu.edu.vn/ER/article/view/299</a>&gt;. Date accessed: 07 may 2024.