Cruz, T.
(2021).
 Non-Destructive Testing and Inspection.
<em>Philippine Engineering Journal, 2</em>(1).
Retrieved from <a href="https://www.journals.upd.edu.ph/index.php/pej/article/view/8425" target="_new">https://www.journals.upd.edu.ph/index.php/pej/article/view/8425</a>