1. International Maritime Organizationhttp://www.imo.org/OurWork/TechnicalCooperation/ITCP/Pages/Default.aspx
2. Energy Efficiency Made in Germanyhttp://www.efficiency-from-germany.info/ENEFF/Navigation/EN/Energyefficiency/Transport/InlandWaterways/inland-waterways.html
3. Shipping Commits to CO2 Roadmap;Hughes,2016