Canada's Ivey school of business, one of the world’s biggest publishers of case studies, is making its case study catalogue available on Apple’s iBookstore. More than 500 cases are available for Can$3.99 each through iTunes. ... Ivey is one of the four case study distributors of note. By far the largest of the four is Harvard Business School, while the Darden school at the University of Virginia writes and distributes case studies of US companies.