Encyclopedias contain overviews of topics, which can include
Use encyclopedia articles to create a list of keywords describing your topic. Then use the keywords to search databases to find articles, books and etc.
Several online encyclopedias cover business and management topics:
Search the library catalog by topic keywords, title of the book, or author's name in reverse order (Porter, Michael instead of Michael Porter)
To focus your search, change "All fields" to "Subject" and use one of these subjects: