Source: University of Pennsylvania
Release: Penn World Table 7.1
For more information and proper citation see http://www.rug.nl/research/ggdc/data/pwt/pwt-7.1
Source Indicator: rgdpl2pe
University of Pennsylvania, Purchasing Power Parity Converted GDP Laspeyres person engaged for Poland [RGDPPEPLA628NUPN], retrieved from FRED, Federal Reserve Bank of St. Louis; https://fred.stlouisfed.org/series/RGDPPEPLA628NUPN, September 20, 2017.