PRZEKOTA, Grzegorz.
 The consequences of price differentiation for regional development in Poland.
<strong>Progress in Economic Sciences</strong>, [S.l.], n. 4, july 2017.
ISSN 2391-5951.
Available at: &lt;<a href="http://pes.pwsz.pila.pl/index.php/PES/article/view/112" target="_new">http://pes.pwsz.pila.pl/index.php/PES/article/view/112</a>&gt;. Date accessed: 16 aug. 2025.
doi: <a href="https://doi.org/10.14595/PES/04/010">https://doi.org/10.14595/PES/04/010</a>.