1. Archibald, D., 2010. Retrieved 10 1, 2013, from David Archibald .info: http://www.davidarchibald.info/papers/Past-and-Future-of-Climate.pdf.
2. The link between the solar dynamo and climate – the evidence from a long mean air temperature series from northern Ireland;Butler;Infrared Astronomical Journal,1994
3. The extra-tropical Northern Hemisphere temperature in the last two millennia: reconstructions of low-frequency variability;Christiansen;Climate of the Past,2012
4. Climate and Clouds: Cloud data., n.d. Retrieved from Climate4You: http://www.climate4you.com/ClimateAndClouds.htm.
5. Cloud Analysis Part 1: Cloud Amount., n.d. Retrieved 11 8, 2014, from International Satellite Cloud Climatology Project: http://isccp.giss.nasa.gov/climanal1.html.