A history of the company until 1999 is found at "Polaroid Corporation History," Funding Universe, http://www.fundinguniverse.com/company-histories/Polaroid-Corporation-Company-History.html (accessed 04/21/2015)
A timeline is also available on the "new" Polaroid company see "History," Polaroid, http://www.polaroid.com/history (accessed 04/21/2015)
For additional information, see "Polaroid Corporation," Wikipedia, http://en.wikipedia.org/wiki/Polaroid_Corporation (accessed 04/21/2015) [unvetted]
"Polaroid Corporation." Encyclopaedia Britannica. Encyclopaedia Britannica Online Academic Edition. Encyclopædia Britannica Inc., 2015. Web. 18 Jun. 2015. <http://academic.eb.com.ezp-prod1.hul.harvard.edu/EBchecked/topic/467177/Polaroid-Corporation>.