Acuna, A.
(2012).
 Philosophical analysis of two-valued deductive logic.
<em>Philippine Social Sciences Review, </em>.
Retrieved from <a href="https://www.journals.upd.edu.ph/index.php/pssr/article/view/2721" target="_new">https://www.journals.upd.edu.ph/index.php/pssr/article/view/2721</a>