There are many sources of research available, both general, nationwide research and market-specific. This curated selection of trusted research resources will help you build the case for sponsorship. It includes general resources from Greater Public, market-specific data resources (such as Neilsen Research), qualitative data provided by Media Audit, and numerous sources for digital research to help quantify and qualify the value of public radio’s digital audiences, and measure the performance of digital sponsorship units across…