A number of sources of evidence: Case study research frequently entails gathering data from multiple resources, which could greatly enhance the robustness and validity on the findings. Experience in 85+ topics. No plagiarism. Hire a crew of Expert case study writers with encounter as part of your subject. To check https://hbrcasestudyanalysis09261.bloggerchest.com/29810833/the-basic-principles-of-hbr-case-study-writing-help