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Zotero is a plugin to the Firefox browser that can be used to record and manage references. Zotero is also available as a stand-alone tool for most other browsers. When you search for literature in, for example, Amazon,ScienceDirect or Google Scholar, and find something of interest, you just click the Zotero icon in Firefox - and then the reference is properly recorded. You may afterwards edit and make add notes to the references, and group them into sub-libraries. If you are using LaTeX for writing reports etc., you can easily export the Zotero references in bib-format to be used with BibTeX - a very efficient tool!