If you are looking for case studies related to business, the Business Source Ultimate database is a useful resource. If you just type case studies in the search box, you will get a lot of results, but those results may not be specific enough for you. Here are tips for getting better results.
Academic OneFile is a general interest database, but it includes several business case journals. Search "business case" OR "business case analysis" OR "business case studies" for the most complete results.
Case Studies in Business Ethics by 
Case Study Handbook: A Student's Guide, Revised Edition by
(EBSCO eBook) Presents a new approach for efficiently analyzing, discussing, and writing about business cases.
Cases on Corporate Social Responsibility and Contemporary Issues in Organizations by
(EBSCO eBook) Provides specific case studies that elaborate on the strategies and policies enacted by contemporary organizations to address environmental and social issues, as well as economic and financial ones.
Pathways to Success by
(EBSCO eBook) Used as a companion guide to Mainstreaming Corporate Sustainability, this case book provides specific examples of companies who have incorporated successful techniques to promote sustainability within their organization. Combined with the textbook, it provides a full curriculum for any introductory course on corporate sustainability. Through the examples of companies from around the world, the reader will learn about best practices and helpful tools, including international standards and performance frameworks, that can be adapted to any company.
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