A place to start may be a general Internet search. A Website that keeps coming up in corporate culture searches is panmore.com. This site has some very concise descriptions of corporate cultures for various companies.
Search the library databases to find articles and information about your company and its corporate culture and structure:
Search these databases for [company name] AND "corporate culture." Use the advanced search option to force your company to be in the Company/organization-ORG field (in ABI/Inform) or the CO Company Entity field in EBSCO. That tells the database to find articles about the specific company you are searching.
In the results list, select an article and then search the full text in the article using Ctrl+F or Command+F to find your company name.
ABI Search Screen
*************************
EBSCO Advanced Search Screen
Perhaps limit the results to the last ten years to keep the results fresh. I found the 2000 Amazon article and stuff about GE from the 1990s, which is way to old for this assignment.
You will hopefully find helpful material, such as Careers: Workers Get New Tools For Airing Their Gripes about Amazon's culture or Grading GE's Turnaround Plan about General Electric.
********************************
Another option to find information about a company's structure or culture might be in EBSCO, Business Source Elite Company Profiles database: