Sources

http://www.chemistryexplained.com/Ce-Co/Colligative-Properties.html
http://www.scienceiscool.org/solutions/vplowering.html
http://www.sparknotes.com/chemistry/solutions/colligative/section1.rhtml
http://www.chem.arizona.edu/~salzmanr/480a/480ants/colprop/colprop.html