The library can be a good place to start looking for information about the company you want to research. There are tools to use, including library databases, to locate case studies quickly as well
You might want to consider starting with databases:
This database contains monographs, major reference works, book digests, conference proceedings, case studies, investment research reports, industry reports, market research reports, country reports, company profiles, SWOT analyses, detailed author profiles and more. Indexing and abstracts for scholarly business journals back as far as 1886 are included.
Finding Case Studies
A great way to study individual companies is to find case studies about them.
Here are some tips to do that:
Try exploring library databases