1. Energy Statistics in 2013 and 2014. Warsaw: Central Statistical Office; 2015.
2. Ligus M. The analysis of competitiveness and potential of renewable energy technologies in Poland. Energy & Environment 2015; 26(8): 1247-1269.
3. Ligus M, Wisniewski G, et. al. Sea wind versus atom, Institute for Renewable Energy. Warsaw: Report drawn up by Institute for Renewable Energy commissioned by Greenpeace and the Heinrich Boell Foundation; 2011.
4. Freeman AM. The benefits of environmental improvement. Theory and practice. London: Johns Hopkins University Press; 1979.
5. Garrod G, Willis KG. Economic valuation of the environment: methods and case studies. Cheltenham: Edward Elgar;1999.