References:

1)http://images.google.com/imgres?imgurl=http://biocab.org/Heat_Transfer.jpg&imgrefurl=http://biocab.org/Heat_Transfer.html&h=540&w=720&sz=82&hl=en&start=6&tbnid=dnOWkPEStxWl5M:&tbnh=105&tbnw=140&prev=/images%3Fq%3Dheat%2Btransfer%2Bby%2Bradiation%26gbv%3D2%26svnum%3D10%26hl%3Den%26sa%3DG

2) http://www.grc.nasa.gov/WWW/K-12/airplane/thermo1.html

3) http://solarscience.msfc.nasa.gov/

4) http://www.physics.sfsu.edu/~lwilliam/111/ch12&13.htm

5) http://hyperphysics.phy-astr.gsu.edu/hbase/indx.html

6) http://sol.sci.uop.edu/~jfalward/heattransfer/heattransfer.html