Research Links This collection of links is designed to help APRA members in their research work. The sites listed below provide access to the most current sites and tools for identifying and qualifying prospective donors. These sites are built and maintained by researchers or their peers, all employed by nonprofits. For-profits are not listed, but can be involved with APRA in other ways. Vendors and consultants can contact APRA headquarters or visit the Sponsors and Partners section for more information.