Hi, I have used the following two resources for case-study reference to teach in my marketing class :
The Case Centre: The Case Centre is a leading global resource for case studies in business and management education. They offer a vast collection of marketing case studies from various institutions and organizations.
Ivey Publishing: Ivey Publishing is another reputable source that offers a wide range of case studies in marketing and other business disciplines.
Hi, I have also completed a research article where I have mentioned 3 case studies. Might be useful for you. Here's the link http://dx.doi.org/10.13140/RG.2.2.36425.93284