SAS, Nataliia.
 The level of happiness as a determinant of sustainable development.
<strong>&lt;center&gt;Conference Proceedings &lt;BR&gt; Determinants Of Regional Development&lt;/center&gt;</strong>, [S.l.], n. 2, p. 280-291, dec. 2021.
Available at: &lt;<a href="http://web.pwsz.pila.pl/~pes/index.php/proceedings/article/view/202" target="_new">http://web.pwsz.pila.pl/~pes/index.php/proceedings/article/view/202</a>&gt;. Date accessed: 20 may 2024.
doi: <a href="https://doi.org/10.14595/CP/02/017">https://doi.org/10.14595/CP/02/017</a>.