OpenCitations has been established as a fully free and open infrastructure to provide access to global scholarly bibliographic and citation data. It provides a data model to describe such data, several collections containing bibliographic and citation data available in CC0, a repository of open-source software developed for gathering data and providing online services to access citation data, such as REST APIs and data dumps. In this workshop, we show how to use OpenCitations as a source of bibliometric data, in particular demonstrating (a) how the REST APIs can return separate information about the citing entities, the cited entities, the citations themselves, and citation counts, and (b) how these data can be called from, integrated with and used in other applications.