Demorgen
Demorgen
http://www.demorgen.be/buitenland/de-dagen-van-de-olie-zijn-geteld-b1a50e3b/
Forbes
Forbes
http://www.forbes.com/forbes/welcome/?toURL=http://www.forbes.com/sites/judeclemente/2015/06/25/how-
IB Times
IB Times
http://www.ibtimes.co.uk/world-energy-day-2014-how-much-oil-left-how-long-will-it-last-1471200
Mens en Samenleving
Mens en Samenleving
http://mens-en-samenleving.infonu.nl/diversen/22382-aardolie-hoe-de-prijs-de-wereld-veranderen-zal.h
National
National
http://ngm.nationalgeographic.com/ngm/0406/feature5/
PeakPeak
PeakPeak
http://www.peakoilandhumanity.com
Peakoil
Peakoil
http://www.peakoil.nl/wp-content/uploads/2009/07/DD19_p43.pdf
Peakoil and Humanity
Peakoil and Humanity
http://www.peakoilandhumanity.com
Wikiepdia
Wikiepdia
http://nl.wikipedia.org/wiki/Hubbertpiek