1. Solar water heating: a viable industry in developing countries;Langniss;Refocus,2004
2. Renewable Energy 2010: Key Facts and Figures for Decision Makers. Global status report. 〈http://www.ren21.net/gsr〉
3. 〈http://www.chinasolarwaterheaters.org/ks-german-solar-water-heater/〉
4. The Renewable Energy & Energy Efficiency Partnership (REEEP) 〈http://www.reeep.org/index.php?assetType=project&assetId=134〉
5. Renewable Energy Technologies, World Energy Assessment (WEA) Report 2001. 〈www.undp.org/seed/eap/activities/wea/drafts-frame.html〉