A bibliographical manager is software that can be used to collect, save and organise your literature references and PDF documents. This software also allows you to create bibliographies and references in various styles and insert these into programmes such as Word. The software makes it possible to search through, sort and share your compiled literature lists.
Leiden University has licences for EndNote. Other software, such as Mendeley and Zotero, are freely available. See an overview of all bibliographical managers on the website of the university library.