1	Dictionary of Science by Neil Aradley (Published by Dorling Kindersley; 1996) Pages 76,78,79
2	Compton's Encyclopedia Book 13 (Published by Compton Learning Company; 1997) Page 199
3	Image of Polarized Light in Compton's Encyclopedia Book 13 (Published by Compton Learning Company; 1997) Page 200
4	Image of prism in Compton's Encyclopedia Book 13 (Published by Compton Learning Company; 1997) Page 200
5	Image of Components of Waves in Compton's Encyclopedia Book 13 (Published by Compton Learning Company; 1997) Page 201
6	The Gale book of science (Published by Lacewings-Phenyl group; 1996) Pages 2102, 2103
7	Oxford Concise Science Dictionary (Published by Oxford University Press; 1996) Page 416
8	Van-Nostrand's Scientific Encyclopedia by Douglas M. Considind (Published by Van Nostrand Reinhold; 1995) Page 1879
9	Book of Sound and Light (Published by Prentice Hall of Science; 1994) Pages 70,71,80,81,82,94-107
10	Discover Light and Sound (Published by HTS Books; 1994) Pages 18,20-24,30,31,36
11	Eyewitness Science of Light (Published by Dorling Kindersley) Pages 20-23,28,29,24-42,48-59
12	Dorling Kindersley Family Encyclopedia of Science Pages 508,509
13	Design in Science by Sally and Adrain Morgans (Published by Evans Books Ltd; 1993) Pages 36,37
14	Images of historical figures in Encarta Encyclopedia CD rom
15	Images of optical instruments in Compton's Interactive Encyclopedia CD rom (All rights Reserved 1992-1996 Softkey Multimedia Inc.)
16	Data of Mirrors http://www.britannica.com/bcom/eb/article/5/0,5716,115155+21+108567,00.html
17	Stars and planets by James Muirden (Published by Kingfisher; 1993) Pg.12,13,14,15,17