This article by Lizzie Seal is adapted from a presentation given at the Sources and Methods in Criminology and Criminal Justice socio-legal research workshop that was held at the Institute of Advanced Legal Studies in November 2015. It explores the selection of qualitative sources for a project that aimed to uncover public responses to capital punishment in the mid twentieth-century. The article discusses which sources were selected and considers their strengths and weaknesses. It concludes that the particular sources chosen as data can, in themselves, help to shape researchers’ thinking about their findings.