Niedziółka, P. „Fluctuations in Banking Sector Liquidity As a Symptom of Financial Instability – Selected Conclusions Based on an Analysis of the Banking Sector in Poland”. Bezpieczny Bank, t. 39, nr 2, grudzień 2009, s. 82-102, https://ojs.bfg.pl/index.php/bb/article/view/538.