1. Combined Heat and Power: A Clean Energy Solution (U.S. Department of Energy, U.S. Environmental Protection Agency, August 2012), http://www1.eere.energy.gov/manufacturing/distributedenergy/pdfs/chp_clean_energy_solution.pdf ).
2. Energy Statistics 2012: Data, Tables, Statistics and Maps. The Danish Energy Agency, February 2014, http://www.ens.dk/sites/ens.dk/files/dokumenter/publikationer/downloads/energy_statistics_2012.pdf .
3. Tom Kerr, CHP/DHC Country Scorecard: the Netherlands (IEA, 2013), http://www.iea.org/media/files/chp/profiles/Netherlands.pdf .
4. The Statistical Information Website of the Kingdom of the Netherlands, http://statline.cbs.nl/statweb/?LA=en .
5. Araceli Fernandez Pales, CHP/DHC Country Scorecard: Finland (IEA, 2013), http://www.iea.org/publications/insights/insightpublications/FinlandScorecard_FINAL.pdf .