Search the library catalogue to find books on business ethics and corporate social responsibility in general, or combined with a company name to see if a larger work has been done on that topic. You can do keyword searches as well as subject searches, which utilize the Library of Congress Subject Headings to locate items on the same subject. Some relevant subject headings include:
These same terms (and more) will work as keyword searches, but you will get many more (and possibly irrelevant) results using a keyword search. Try both and take it from there. If you search any term in the 'subject' field, the catalogue will try to suggest related subjects for you to try. Of course, if you know the title or author of a book, you can search the catalogue using those fields as well.
You can also do an 'advanced keyword search' and restrict the 'material type' to limit your search to e-books only if you prefer that.