NICHOLAS, Ryan Ralph.
 An Inquiry into the Nature and Causes of the Happiness of Nations.
<strong>Philippine Social Sciences Review</strong>, [S.l.], may 2018.
ISSN 2672-3158.
Available at: &lt;<a href="https://www.journals.upd.edu.ph/index.php/pssr/article/view/6148" target="_new">https://www.journals.upd.edu.ph/index.php/pssr/article/view/6148</a>&gt;. Date accessed: 06 aug. 2025.