World Advertising Research Centre (WARC)A York Libraries' subscription database. The Case Studies tab offers many links of relevance. For example, the Latest Awards section offers case study analysis of award-winning brand campaigns from well-known marketing and advertising competitions. This includes coverage of areas such as campaign objectives, strategy, and results.
The campaign videos, WARC Prizes and WARC 100 are also worth consulting for further examples of award-winning advertising campaigns.