Borowski, K. (2015) “An Analysis of Selected Seasonal Rates of Return on the Silver Market from 30.10.2003 to 31.12.2013”, Krakow Review of Economics and Management/Zeszyty Naukowe Uniwersytetu Ekonomicznego w Krakowie, (1(937), pp. 5–26. doi:10.15678/ZNUEK.2015.0937.0101.