LEWKOWICZ-GRZEGORCZYK, Katarzyna Anna.
 The concept of fairness as a criterion for the assessment of the personal income tax in Poland.
<strong>Optimum. Economic Studies</strong>, [S.l.], n. 4(106), p. 83-96, wrz. 2021.
ISSN 1506-7637.
Dostępne w: &lt;<a href="http://optimum.uwb.edu.pl/index.php/osj/article/view/487" target="_new">http://optimum.uwb.edu.pl/index.php/osj/article/view/487</a>&gt;. Data dostępu: 25 maj 2022.
doi: <a href="https://doi.org/10.15290/oes.2021.04.106.07">https://doi.org/10.15290/oes.2021.04.106.07</a>.