Using the library search may lead to specific journal titles. In this instance you can search directly from the journal titles. The following are examples of journals that publish business case studies. Use the "Search within this publication" (below example) by entering a keyword. Searching case studies within a journal gives a narrower but more relevant results.
Use relevant keywords and select "Subject Terms" (below example). The journal will retrieve all case studies that have the selected keyword "leadership" indexed in its subjects.